diff --git a/src/frontend/apps/impress/src/features/docs/doc-editor/assets/warning.svg b/src/frontend/apps/impress/src/features/docs/doc-editor/assets/warning.svg
index 531a6260b..0c6122324 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-editor/assets/warning.svg
+++ b/src/frontend/apps/impress/src/features/docs/doc-editor/assets/warning.svg
@@ -1,5 +1,6 @@
 <svg
   xmlns="http://www.w3.org/2000/svg"
+  aria-hidden="true"
   width="24"
   height="24"
   viewBox="0 0 24 24"
diff --git a/src/frontend/apps/impress/src/features/docs/doc-editor/components/custom-blocks/UploadLoaderBlock.tsx b/src/frontend/apps/impress/src/features/docs/doc-editor/components/custom-blocks/UploadLoaderBlock.tsx
index 5bf4056ae..c237f3dbc 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-editor/components/custom-blocks/UploadLoaderBlock.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-editor/components/custom-blocks/UploadLoaderBlock.tsx
@@ -6,10 +6,11 @@ import {
   StyleSchema,
 } from '@blocknote/core';
 import { createReactBlockSpec } from '@blocknote/react';
+import { announce } from '@react-aria/live-announcer';
 import { t } from 'i18next';
 import { useEffect } from 'react';
 
-import { Card, Icon, Text } from '@/components';
+import { Box, Icon, Text } from '@/components';
 import { useMediaUrl } from '@/core';
 import { isSafeUrl } from '@/utils/url';
 
@@ -114,16 +115,19 @@ const UploadLoaderBlockComponent = ({
 
         console.error('Error analyzing file:', error);
 
+        const information = t(
+          'The antivirus has detected an anomaly in your file.',
+        );
+
         try {
           editor.updateBlock(block.id, {
             type: 'uploadLoader',
             props: {
               type: 'warning',
-              information: t(
-                'The antivirus has detected an anomaly in your file.',
-              ),
+              information,
             },
           });
+          announce(information, 'assertive');
         } catch {
           /* During collaboration, another user might have updated the block */
         }
@@ -135,14 +139,16 @@ const UploadLoaderBlockComponent = ({
   }, [block, editor, mediaUrl, isEditable]);
 
   return (
-    <Card
+    <Box
       className="bn-visual-media-wrapper"
       $direction="row"
       $gap="xs"
       $withThemeBG
       $border="none"
+      $radius="var(--c--globals--spacings--st)"
       $theme="neutral"
       $scope="semantic"
+      $variation="tertiary"
       $width="100%"
       $padding="xs"
     >
@@ -158,7 +164,7 @@ const UploadLoaderBlockComponent = ({
       <Text $variation="tertiary" $weight={500}>
         {block.props.information}
       </Text>
-    </Card>
+    </Box>
   );
 };
 
diff --git a/src/frontend/apps/impress/src/features/docs/doc-editor/hook/__tests__/useUploadFile.test.tsx b/src/frontend/apps/impress/src/features/docs/doc-editor/hook/__tests__/useUploadFile.test.tsx
index b31099bcb..87932521d 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-editor/hook/__tests__/useUploadFile.test.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-editor/hook/__tests__/useUploadFile.test.tsx
@@ -69,6 +69,7 @@ describe('useUploadFile', () => {
     expect(mockToast).toHaveBeenCalledWith(
       'The file "video.mp4" is too large. Maximum file size is 1KB.',
       'error',
+      { duration: 10000 },
     );
   });
 
@@ -89,6 +90,7 @@ describe('useUploadFile', () => {
     expect(mockToast).toHaveBeenCalledWith(
       'A problem occurred while uploading the file, cause: File type not allowed.',
       'error',
+      { duration: 10000 },
     );
   });
 });
diff --git a/src/frontend/apps/impress/src/features/docs/doc-editor/hook/useUploadFile.tsx b/src/frontend/apps/impress/src/features/docs/doc-editor/hook/useUploadFile.tsx
index cd6330ebd..f6f1df03d 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-editor/hook/useUploadFile.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-editor/hook/useUploadFile.tsx
@@ -1,5 +1,6 @@
 import { Block } from '@blocknote/core';
 import { VariantType } from '@gouvfr-lasuite/ui-components';
+import { announce } from '@react-aria/live-announcer';
 import { captureException } from '@sentry/nextjs';
 import { useCallback, useEffect } from 'react';
 import { useTranslation } from 'react-i18next';
@@ -16,6 +17,9 @@ import { DocsBlockNoteEditor } from '../types';
 
 const DEFAULT_MAX_FILE_SIZE = 10 * 1024 * 1024; // Default to 10MB
 
+// Upload errors carry a cause the user has to read: keep them longer than the default toast.
+const UPLOAD_ERROR_TOAST_DURATION = 10000;
+
 const TEXT_ALIGNMENTS = ['left', 'center', 'right', 'justify'] as const;
 
 type TextAlignment = (typeof TEXT_ALIGNMENTS)[number];
@@ -63,6 +67,7 @@ export const useUploadFile = (docId: string) => {
             },
           ),
           VariantType.ERROR,
+          { duration: UPLOAD_ERROR_TOAST_DURATION },
         );
 
         throw new Error('File is too large');
@@ -88,6 +93,7 @@ export const useUploadFile = (docId: string) => {
                 'A problem occurred while uploading the file, please try again.',
               ),
           VariantType.ERROR,
+          { duration: UPLOAD_ERROR_TOAST_DURATION },
         );
 
         throw error;
@@ -114,7 +120,7 @@ export const useUploadStatus = (editor: DocsBlockNoteEditor) => {
    * Replace the resource block by a uploadLoader block to show analyzing status
    */
   const replaceBlockWithUploadLoader = useCallback(
-    (block: Block) => {
+    (block: Block, shouldAnnounce = false) => {
       if (
         !block ||
         !('url' in block.props) ||
@@ -133,13 +139,15 @@ export const useUploadStatus = (editor: DocsBlockNoteEditor) => {
       const blockUploadTextAlignment = fileTextAlignment(block.props);
 
       try {
+        const information = t('Analyzing the file');
+
         editor.replaceBlocks(
           [block.id],
           [
             {
               type: 'uploadLoader',
               props: {
-                information: t('Analyzing the file'),
+                information,
                 type: 'loading',
                 blockUploadName,
                 blockUploadType,
@@ -151,6 +159,12 @@ export const useUploadStatus = (editor: DocsBlockNoteEditor) => {
             },
           ],
         );
+
+        // Only the user who uploaded the file hears it, not the collaborators
+        // nor a page reload.
+        if (shouldAnnounce) {
+          announce(information, 'polite');
+        }
       } catch (error) {
         captureException(error, {
           extra: { info: 'Error replacing block for upload loader' },
@@ -194,7 +208,7 @@ export const useUploadStatus = (editor: DocsBlockNoteEditor) => {
       const innerTimeoutId = setTimeout(() => {
         const block = editor.getBlock({ id: blockId });
 
-        replaceBlockWithUploadLoader(block as Block);
+        replaceBlockWithUploadLoader(block as Block, true);
       }, 300);
 
       return () => {