# Offline behavior and notifications
> Understand cached history, queued messages, reconnect behavior, and attention alerts on iPhone.
Canonical URL: https://docs.zuse.sh/mobile/offline-notifications
Zuse treats a mobile network interruption as recoverable state. The app retains its last downloaded projects, chats, sessions, and messages, then reconciles them with the environment when the connection returns.
## What remains available [#what-remains-available]
* The most recent downloaded inbox and session list.
* Cached conversation messages and timeline state.
* Messages already placed in the per-session outbox.
* Connection records needed to retry the environment.
Live agent output, new project reads, file browsing, approvals, and execution require an online environment.
## Sending while offline [#sending-while-offline]
When a session is offline, the composer can place a message in its outbox. The queue is durable on the phone and preserves order. After reconnection, Zuse submits each queued item to the server; it removes an item only after the server accepts it.
If sending fails again, the message stays visible with an error so you can retry. Avoid duplicating it manually unless you have confirmed the server did not accept the original.
## App backgrounding [#app-backgrounding]
When iOS backgrounds Zuse, the active transport is treated as offline. Cached screens remain available, and the connection supervisor reconnects when the app becomes active again. A brief **Connecting** or **Reconnecting** state after returning is expected.
## Notifications [#notifications]
Hosted remote access can notify the phone when an agent needs an approval or answer:
1. Sign in under **Settings → Remote access**.
2. Open **Settings → Notifications**.
3. Choose **Enable notifications** and allow the iOS permission.
If notifications are off, open iPhone Settings and allow notifications for Zuse. Notifications are an attention aid, not the source of truth; pending prompts also appear inside the relevant session.
## Storage controls [#storage-controls]
**Clear downloaded data** removes cached projects, chats, and messages, then fetches them again as needed. It deliberately keeps connections and unsent messages.
**Reset app** removes everything stored by Zuse on that phone, including the outbox. Your remote account and environment data remain unless you separately choose **Delete account**.
Use iOS notification-preview controls if approval or question text should not appear on the lock screen. Treat a remotely connected phone as an authenticated workspace client.