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itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/category/features"><span itemprop="name">Features</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">File Upload and Download in Documentation</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>File Upload and Download in Documentation</h1><div class="availabilityCard_P5od card"><strong>Feature Availability</strong><div><span class="platform_wqXv platformAvailable_Y8lN">Self-Hosted DataHub <span role="img" aria-label="check-circle" class="anticon anticon-check-circle"><svg viewBox="64 64 896 896" focusable="false" data-icon="check-circle" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M512 64C264.6 64 64 264.6 64 512s200.6 448 448 448 448-200.6 448-448S759.4 64 512 64zm193.5 301.7l-210.6 292a31.8 31.8 0 01-51.7 0L318.5 484.9c-3.8-5.3 0-12.7 6.5-12.7h46.9c10.2 0 19.9 4.9 25.9 13.3l71.2 98.8 157.2-218c6-8.3 15.6-13.3 25.9-13.3H699c6.5 0 10.3 7.4 6.5 12.7z"></path></svg></span></span></div><div><span role="img" aria-label="cloud" class="anticon anticon-cloud managedIcon_AxXO"><svg viewBox="64 64 896 896" focusable="false" data-icon="cloud" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M811.4 418.7C765.6 297.9 648.9 212 512.2 212S258.8 297.8 213 418.6C127.3 441.1 64 519.1 64 612c0 110.5 89.5 200 199.9 200h496.2C870.5 812 960 722.5 960 612c0-92.7-63.1-170.7-148.6-193.3zm36.3 281a123.07 123.07 0 01-87.6 36.3H263.9c-33.1 0-64.2-12.9-87.6-36.3A123.3 123.3 0 01140 612c0-28 9.1-54.3 26.2-76.3a125.7 125.7 0 0166.1-43.7l37.9-9.9 13.9-36.6c8.6-22.8 20.6-44.1 35.7-63.4a245.6 245.6 0 0152.4-49.9c41.1-28.9 89.5-44.2 140-44.2s98.9 15.3 140 44.2c19.9 14 37.5 30.8 52.4 49.9 15.1 19.3 27.1 40.7 35.7 63.4l13.8 36.5 37.8 10c54.3 14.5 92.1 63.8 92.1 120 0 33.1-12.9 64.3-36.3 87.7z"></path></svg></span><span class="platform_wqXv platformAvailable_Y8lN">DataHub Cloud <span role="img" aria-label="check-circle" class="anticon anticon-check-circle"><svg viewBox="64 64 896 896" focusable="false" data-icon="check-circle" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M512 64C264.6 64 64 264.6 64 512s200.6 448 448 448 448-200.6 448-448S759.4 64 512 64zm193.5 301.7l-210.6 292a31.8 31.8 0 01-51.7 0L318.5 484.9c-3.8-5.3 0-12.7 6.5-12.7h46.9c10.2 0 19.9 4.9 25.9 13.3l71.2 98.8 157.2-218c6-8.3 15.6-13.3 25.9-13.3H699c6.5 0 10.3 7.4 6.5 12.7z"></path></svg></span></span></div></div><p>DataHub's File Upload and Download capability enables you to enrich your asset and column documentation with supporting files like images, diagrams, and other resources, making your data catalog more informative and easier to understand.</p><p align="center"><img loading="lazy" width="70%" src="https://raw.githubusercontent.com/datahub-project/static-assets/refs/heads/main/imgs/file_upload_download/drop_file_upload.png" alt="Dropping a file to upload" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="why-use-file-uploads-in-documentation">Why Use File Uploads in Documentation?<a href="#why-use-file-uploads-in-documentation" class="hash-link" aria-label="Direct link to Why Use File Uploads in Documentation?" title="Direct link to Why Use File Uploads in Documentation?"></a></h2><p>File uploads transform how you document and communicate about your data assets by enabling you to:</p><ul><li><strong>Enhance Documentation Quality</strong>: Add visual diagrams, architecture drawings, and screenshots directly into your documentation to illustrate complex concepts</li><li><strong>Centralize Resources</strong>: Keep all relevant documentation materials in one place alongside your data assets rather than scattered across multiple systems</li><li><strong>Improve Understanding</strong>: Help users grasp data structures, pipelines, and relationships faster with visual aids embedded directly in context</li><li><strong>Standardize Communication</strong>: Create consistent, professional documentation that combines text and visual elements</li></ul><p>Whether you're a data engineer documenting a complex data pipeline, a data analyst explaining column definitions with example screenshots, or a data steward providing reference materials, file uploads make your documentation more comprehensive and accessible.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="whats-included">What's Included<a href="#whats-included" class="hash-link" aria-label="Direct link to What's Included" title="Direct link to What's Included"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="supported-file-types">Supported File Types<a href="#supported-file-types" class="hash-link" aria-label="Direct link to Supported File Types" title="Direct link to Supported File Types"></a></h3><p>Currently, images are displayed inline within your documentation. Files of other types can be uploaded and downloaded, with support for additional inline previews (like PDFs and text files) coming in future releases.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="upload-methods">Upload Methods<a href="#upload-methods" class="hash-link" aria-label="Direct link to Upload Methods" title="Direct link to Upload Methods"></a></h3><p>You have two convenient ways to add files to your documentation:</p><ul><li><strong>Drag and Drop</strong>: Simply drag files from your file system directly into the documentation editor</li><li><strong>Upload Button</strong>: Click the upload file button in the editor toolbar to browse and select files from your file system</li></ul><p align="center"><img loading="lazy" width="70%" src="https://raw.githubusercontent.com/datahub-project/static-assets/refs/heads/main/imgs/file_upload_download/upload_file_button.png" alt="Option to choose a file from your system" class="img_ev3q"></p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="file-management">File Management<a href="#file-management" class="hash-link" aria-label="Direct link to File Management" title="Direct link to File Management"></a></h3><p>When you upload a file, DataHub automatically:</p><ul><li>Creates a new <code>dataHubFile</code> entity to track metadata about your file (type, size, original filename)</li><li>Stores the context of where you uploaded the file (asset documentation, column documentation, etc.)</li><li>Uses this context information to enforce permissions when users attempt to download files</li></ul><p>Files are securely stored in S3, and access is controlled based on the user's permissions for the asset where the file was uploaded.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="setting-up-file-uploads">Setting Up File Uploads<a href="#setting-up-file-uploads" class="hash-link" aria-label="Direct link to Setting Up File Uploads" title="Direct link to Setting Up File Uploads"></a></h2><p>File upload functionality requires configuration to connect DataHub to your S3 storage.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="prerequisites">Prerequisites<a href="#prerequisites" class="hash-link" aria-label="Direct link to Prerequisites" title="Direct link to Prerequisites"></a></h3><p>Your DataHub instance must be deployed on AWS for the AWS role authentication to work seamlessly.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="required-configuration">Required Configuration<a href="#required-configuration" class="hash-link" aria-label="Direct link to Required Configuration" title="Direct link to Required Configuration"></a></h3><p>Set the following environment variables in your DataHub GMS service:</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="datahub_bucket_name">DATAHUB_BUCKET_NAME<a href="#datahub_bucket_name" class="hash-link" aria-label="Direct link to DATAHUB_BUCKET_NAME" title="Direct link to DATAHUB_BUCKET_NAME"></a></h4><p>The name of your S3 bucket where uploaded files will be stored.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token assign-left variable" style="color:rgb(191, 199, 213)">DATAHUB_BUCKET_NAME</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">your-datahub-files-bucket</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="datahub_role_arn">DATAHUB_ROLE_ARN<a href="#datahub_role_arn" class="hash-link" aria-label="Direct link to DATAHUB_ROLE_ARN" title="Direct link to DATAHUB_ROLE_ARN"></a></h4><p>The AWS role ARN configured with permissions to upload and download files from your S3 bucket.</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token assign-left variable" style="color:rgb(191, 199, 213)">DATAHUB_ROLE_ARN</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">arn:aws:iam::123456789012:role/DataHubFileAccessRole</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="aws-role-configuration">AWS Role Configuration<a href="#aws-role-configuration" class="hash-link" aria-label="Direct link to AWS Role Configuration" title="Direct link to AWS Role Configuration"></a></h3><p>Your AWS role must be properly configured with two key requirements:</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="s3-permissions">S3 Permissions<a href="#s3-permissions" class="hash-link" aria-label="Direct link to S3 Permissions" title="Direct link to S3 Permissions"></a></h4><p>The role needs appropriate permissions to interact with your S3 bucket. At minimum, this should include:</p><ul><li><code>s3:PutObject</code> - To upload files</li><li><code>s3:GetObject</code> - To download files</li><li><code>s3:DeleteObject</code> - For garbage collection of unused files</li></ul><p>Configure these permissions through an IAM policy attached to the role.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="trust-relationship">Trust Relationship<a href="#trust-relationship" class="hash-link" aria-label="Direct link to Trust Relationship" title="Direct link to Trust Relationship"></a></h4><p>Update the trust relationship for your role to allow your DataHub GMS service to assume it. The trust policy should permit the AWS service or role that your DataHub GMS is running under to assume this role.</p><p>Without proper trust relationship configuration, DataHub will not be able to authenticate with AWS to access your S3 bucket.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="uploading-files">Uploading Files<a href="#uploading-files" class="hash-link" aria-label="Direct link to Uploading Files" title="Direct link to Uploading Files"></a></h2><p>To add files to your documentation:</p><ol><li>Navigate to the asset or column where you want to add documentation</li><li>Open the documentation editor</li><li>Either:<ul><li>Drag and drop your file directly into the editor, or</li><li>Click the upload file button in the toolbar and select your file from the file system dialog</li></ul></li><li>Images will appear inline immediately; other file types will show as downloadable links</li><li>Save your documentation changes</li></ol><p>Files are uploaded to S3 as soon as you add them to the editor, even before you save your documentation changes.</p><p align="center"><img loading="lazy" width="70%" src="https://raw.githubusercontent.com/datahub-project/static-assets/refs/heads/main/imgs/file_upload_download/image_file_example.png" alt="Image file rendered inline" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="downloading-files">Downloading Files<a href="#downloading-files" class="hash-link" aria-label="Direct link to Downloading Files" title="Direct link to Downloading Files"></a></h2><p>When users view documentation containing uploaded files:</p><ul><li><strong>Images</strong>: Display inline automatically within the documentation</li><li><strong>Other Files</strong>: Appear as download links that users can click to retrieve the file</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="permission-checks">Permission Checks<a href="#permission-checks" class="hash-link" aria-label="Direct link to Permission Checks" title="Direct link to Permission Checks"></a></h3><p>When a user attempts to download a file, DataHub verifies that they have permission to view the asset or column where the file was originally uploaded. This ensures that file access respects your existing DataHub permission structure.</p><p>If a user doesn't have permission to view the associated asset, they won't be able to download the file, even if they have a direct link to it.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="file-metadata-and-tracking">File Metadata and Tracking<a href="#file-metadata-and-tracking" class="hash-link" aria-label="Direct link to File Metadata and Tracking" title="Direct link to File Metadata and Tracking"></a></h2><p>Each uploaded file is represented as a <code>dataHubFile</code> entity in DataHub, which stores:</p><ul><li><strong>File type</strong>: The MIME type of the uploaded file</li><li><strong>File size</strong>: Size in bytes</li><li><strong>Original filename</strong>: The name of the file when it was uploaded</li><li><strong>Upload context</strong>: The entity (asset or column) where the file was added</li></ul><p>This metadata enables future features like file search, usage tracking, and cleanup of orphaned files.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="best-practices">Best Practices<a href="#best-practices" class="hash-link" aria-label="Direct link to Best Practices" title="Direct link to Best Practices"></a></h2><p>When using file uploads in your documentation:</p><ul><li><strong>Use descriptive filenames</strong>: Original filenames are preserved, making it easier to identify files later</li><li><strong>Optimize image sizes</strong>: Large images may take longer to load; consider resizing before upload</li><li><strong>Provide context</strong>: Add text descriptions around images to explain what users are seeing</li><li><strong>Consider alternatives for large files</strong>: For very large files, consider linking to external storage rather than uploading directly</li><li><strong>Review permissions</strong>: Ensure your S3 role and bucket permissions are configured correctly before enabling this feature for users</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="troubleshooting">Troubleshooting<a href="#troubleshooting" class="hash-link" aria-label="Direct link to Troubleshooting" title="Direct link to Troubleshooting"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="files-not-uploading">Files Not Uploading<a href="#files-not-uploading" class="hash-link" aria-label="Direct link to Files Not Uploading" title="Direct link to Files Not Uploading"></a></h3><p>If files fail to upload, check:</p><ul><li>Your <code>DATAHUB_BUCKET_NAME</code> is set correctly and the bucket exists</li><li>Your <code>DATAHUB_ROLE_ARN</code> is valid and points to an existing role</li><li>The trust relationship on your AWS role permits your DataHub GMS to assume it</li><li>The role has necessary S3 permissions (<code>s3:PutObject</code>)</li><li>Ensure that your S3 bucket has a CORS policy set to accept uploads from your host URL</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="files-not-downloading">Files Not Downloading<a href="#files-not-downloading" class="hash-link" aria-label="Direct link to Files Not Downloading" title="Direct link to Files Not Downloading"></a></h3><p>If users cannot download files, verify:</p><ul><li>Users have permission to view the asset where the file was uploaded</li><li>Your AWS role has <code>s3:GetObject</code> permissions on the bucket</li><li>The file still exists in S3 (hasn't been manually deleted)</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="authentication-issues">Authentication Issues<a href="#authentication-issues" class="hash-link" aria-label="Direct link to Authentication Issues" title="Direct link to Authentication Issues"></a></h3><p>If you see AWS authentication errors:</p><ul><li>Confirm your DataHub instance is deployed on AWS</li><li>Verify the trust relationship configuration on your AWS role</li><li>Check that your GMS service has the necessary AWS credentials or instance profile</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="next-steps">Next Steps<a href="#next-steps" class="hash-link" aria-label="Direct link to Next Steps" title="Direct link to Next Steps"></a></h2><p>Now that you understand how to use file uploads in documentation:</p><ul><li><strong>Configure your environment</strong>: Set up the required S3 bucket and AWS role</li><li><strong>Test with images</strong>: Start by uploading images to asset documentation to see how inline display works</li><li><strong>Train your team</strong>: Show data owners and stewards how to enrich their documentation with visual aids</li><li><strong>Monitor usage</strong>: Keep an eye on your S3 bucket to understand storage needs</li><li><strong>Stay tuned</strong>: Watch for upcoming features like PDF previews and additional file type support</li></ul><p>File uploads are designed to make your DataHub documentation more comprehensive and user-friendly, helping your organization build a richer, more informative data catalog.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? 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Documentation?</a></li><li><a href="#whats-included" class="table-of-contents__link toc-highlight">What's Included</a><ul><li><a href="#supported-file-types" class="table-of-contents__link toc-highlight">Supported File Types</a></li><li><a href="#upload-methods" class="table-of-contents__link toc-highlight">Upload Methods</a></li><li><a href="#file-management" class="table-of-contents__link toc-highlight">File Management</a></li></ul></li><li><a href="#setting-up-file-uploads" class="table-of-contents__link toc-highlight">Setting Up File Uploads</a><ul><li><a href="#prerequisites" class="table-of-contents__link toc-highlight">Prerequisites</a></li><li><a href="#required-configuration" class="table-of-contents__link toc-highlight">Required Configuration</a></li><li><a href="#aws-role-configuration" class="table-of-contents__link toc-highlight">AWS Role Configuration</a></li></ul></li><li><a href="#uploading-files" class="table-of-contents__link toc-highlight">Uploading 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