diff --git a/packages/core/helper-plugin/src/hooks/useSelectionState/index.js b/packages/core/helper-plugin/src/hooks/useSelectionState/index.js
index 26b1d260a8..5dd8d4ece6 100644
--- a/packages/core/helper-plugin/src/hooks/useSelectionState/index.js
+++ b/packages/core/helper-plugin/src/hooks/useSelectionState/index.js
@@ -35,11 +35,13 @@ export const useSelectionState = (keys, initialValue) => {
   };
 
   const selectMultiple = (nextSelections) => {
-    setSelections([
-      ...selections,
+    setSelections((currSelections) => [
+      // already selected items
+      ...currSelections,
+      // filter out already selected items from nextSelections
       ...nextSelections.filter(
         (nextSelection) =>
-          selections.findIndex((currentSelection) =>
+          currSelections.findIndex((currentSelection) =>
             keys.every((key) => currentSelection[key] === nextSelection[key])
           ) === -1
       ),
@@ -47,8 +49,9 @@ export const useSelectionState = (keys, initialValue) => {
   };
 
   const deselectMultiple = (nextSelections) => {
-    setSelections([
-      ...selections.filter(
+    setSelections((currSelections) => [
+      // filter out items in currSelections that are in nextSelections
+      ...currSelections.filter(
         (currentSelection) =>
           nextSelections.findIndex((nextSelection) =>
             keys.every((key) => currentSelection[key] === nextSelection[key])
diff --git a/packages/core/helper-plugin/src/hooks/useSelectionState/useSelectionState.stories.mdx b/packages/core/helper-plugin/src/hooks/useSelectionState/useSelectionState.stories.mdx
index c2c473fd3f..3a0434b277 100644
--- a/packages/core/helper-plugin/src/hooks/useSelectionState/useSelectionState.stories.mdx
+++ b/packages/core/helper-plugin/src/hooks/useSelectionState/useSelectionState.stories.mdx
@@ -14,7 +14,7 @@ This hook is used in order to facilitate the select / partial selection of a glo
 import { useSelectionState } from '@strapi/helper-plugin';
 
 const Modal = ({ onToggle, isOpen }) => {
-  const [selectedAssets, { selectOne, selectAll, selectOnly, setSelections }] = useSelectionState(
+  const [selectedAssets, { selectOne, selectAll, selectOnly, selectMultiple, deselectMultiple, setSelections }] = useSelectionState(
     ['id'], // This are the comparaison attribute names
     []
   );
@@ -24,6 +24,8 @@ const Modal = ({ onToggle, isOpen }) => {
   // selectOne({ id: 1 name: 'Hello' }) add the object to the selection list
   // selectOnly({ id: 1 name: 'Hello' }) add the object to the selection list and remove every others in the list
   // selectAll(assets) select all or remove all
+  // selectMultiple(assets) add the objects to the selection list - does not change already selected objects
+  // deselectMultiple(assets) remove the objects from the selection list - does not change already selected objects
   // setSelections(): regular state used in react
 
   return (
diff --git a/packages/core/upload/admin/src/components/AssetDialog/index.js b/packages/core/upload/admin/src/components/AssetDialog/index.js
index 429f9da712..ce93f40b4a 100644
--- a/packages/core/upload/admin/src/components/AssetDialog/index.js
+++ b/packages/core/upload/admin/src/components/AssetDialog/index.js
@@ -108,6 +108,7 @@ export const AssetDialog = ({
       return undefined;
     }
 
+    // selected files in current folder
     const alreadySelected = allowedAssets.filter(
       (asset) => selectedAssets.findIndex((selectedAsset) => selectedAsset.id === asset.id) !== -1
     );