WhatsApp for Samsung Galaxy Z Fold 3

WhatsApp doesn't always rescale when you switch to the large inner display, so it can stay in a narrow phone-width column. First enable the resize option: go to Settings > Advanced features > Labs and turn on 'Multi window for all apps' (and 'Pop-up view actions' if listed). Now when you open WhatsApp on the unfolded screen, a small floating bar or aspect-ratio/resize icon appears at the edge — tap it and choose the full-screen / maximize option. Close WhatsApp from Recents and reopen it so the new layout sticks. See how others solved this on Reddit

This usually comes from a stale app cache or the microphone permission being dropped, which can break recording or playback. Go to Settings > Apps > WhatsApp > Storage and tap Clear cache, then go to Settings > Apps > WhatsApp > Permissions and confirm Microphone is set to Allow. If it still fails, update WhatsApp from the Play Store and restart the phone, since a lingering background process can hold onto the audio path until you reboot. See how others solved this on Reddit

Samsung's Multi window has a gesture where swiping inward from a top corner launches an app as a floating pop-up window, and it's easy to trigger by accident. To stop it, go to Settings > Advanced features > Multi window and turn off 'Swipe for pop-up view' (sometimes under Labs). If WhatsApp is already floating, drag the bar at the top of the window and tap the maximize icon, or just close it from Recents and reopen it normally to return it to full screen. See how others solved this on Reddit

On Samsung phones the battery optimizer often puts WhatsApp to sleep, which silently stops notifications. Go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted, then open Settings > Battery and device care > Battery > Background usage limits and make sure WhatsApp isn't under Sleeping or Deep sleeping apps (remove it if it is). Finally, in Settings > Apps > WhatsApp > Notifications, confirm alerts are turned on for messages and groups. See how others solved this on Reddit

iPhone (iCloud) backups can't be restored on Android, so you must use WhatsApp's official 'Move to Android' transfer, and it only works during the initial setup of the Z Fold 3 (you may need to factory reset if it's already set up). During setup, choose to copy data, connect the iPhone and the Fold 3 with a cable when prompted, then scan the on-screen QR code with the iPhone — the chats transfer directly over the cable. Afterward, set up Settings > Chats > Chat backup to Google Drive so future restores stay on Android. See how others solved this on Reddit

First back up on your old phone via WhatsApp > Settings > Chats > Chat backup, signed in with the same Google account you'll use on the Fold 3. On the new phone, install WhatsApp from the Play Store and verify the same phone number, then tap Restore when it detects the Google Drive backup. Both phones must use the identical Google account and the same phone number, or the restore prompt won't appear. See how others solved this on Reddit