diff --git a/ts/components/session/ActionsPanel.tsx b/ts/components/session/ActionsPanel.tsx
index b6c6c90e1..21796b262 100644
--- a/ts/components/session/ActionsPanel.tsx
+++ b/ts/components/session/ActionsPanel.tsx
@@ -8,6 +8,7 @@ import { UserUtils } from '../../session/utils';
 import { syncConfigurationIfNeeded } from '../../session/utils/syncUtils';
 import { DAYS, MINUTES } from '../../session/utils/Number';
 import {
+  createOrUpdateItem,
   generateAttachmentKeyIfEmpty,
   getItemById,
   hasSyncedInitialConfigurationItem,
@@ -44,6 +45,20 @@ export enum SectionType {
   Moon,
 }
 
+const showUnstableAttachmentsDialogIfNeeded = async () => {
+  const alreadyShown = (await getItemById('showUnstableAttachmentsDialog'))?.value;
+
+  if (!alreadyShown) {
+    window.confirmationDialog({
+      title: 'File server update',
+      message:
+        "We're upgrading the way files are stored. File transfer may be unstable for the next 24-48 hours.",
+    });
+
+    await createOrUpdateItem({ id: 'showUnstableAttachmentsDialog', value: true });
+  }
+};
+
 const Section = (props: { type: SectionType; avatarPath?: string }) => {
   const ourNumber = useSelector(getOurNumber);
   const unreadMessageCount = useSelector(getUnreadMessageCount);
@@ -157,6 +172,7 @@ const doAppStartUp = (dispatch: Dispatch<any>) => {
     void OnionPaths.getInstance().buildNewOnionPaths();
   }
 
+  void showUnstableAttachmentsDialogIfNeeded();
   // init the messageQueue. In the constructor, we add all not send messages
   // this call does nothing except calling the constructor, which will continue sending message in the pipeline
   void getMessageQueue().processAllPending();