WhatsApp for Samsung Galaxy Z Fold 4

WhatsApp sometimes opens letterboxed on the inner screen because it doesn't request the foldable's tall aspect ratio. Go to Settings > Display > Full screen apps, find WhatsApp, and make sure it's toggled on. If it still looks boxed-in, open WhatsApp and tap the bar at the top/edge (or use the recents/multi-window menu) to choose Full screen for the app, then fully close WhatsApp and reopen it. Switching once between the cover and main screen can also force the layout to resize. See how others solved this on Reddit

WhatsApp re-compresses videos when you attach them from the gallery, which hits the Fold 4's high-resolution clips hardest. To keep original quality, in a chat tap the attach (paperclip) icon, choose Document instead of Gallery, and pick the video that way so it sends uncompressed (subject to WhatsApp's file-size limit). For everyday sharing, also set WhatsApp > Settings > Storage and data > Media upload quality to HD quality. See how others solved this on Reddit

The stutter comes from WhatsApp re-rendering its layout each time it resizes into a split-screen window. Make sure both WhatsApp and One UI are fully updated, clear WhatsApp's cache via Settings > Apps > WhatsApp > Storage > Clear cache, and set the app's battery usage to Unrestricted in Settings > Apps > WhatsApp > Battery. Reducing how often it has to relayout — for example keeping WhatsApp set to Full screen rather than switching aspect ratios — also helps smooth out split-view transitions. See how others solved this on Reddit

This is usually a microphone-permission or background-restriction issue rather than hardware. Check Settings > Apps > WhatsApp > Permissions and confirm Microphone is allowed, then set the app's battery usage to Unrestricted in Settings > Apps > WhatsApp > Battery so recording isn't killed mid-message. If recording or playback is still broken, clear WhatsApp's cache and update to the latest build from the Play Store, since older versions had voice-note bugs on Fold devices. See how others solved this on Reddit

On the old phone, back up first via WhatsApp > Settings > Chats > Chat backup and tap Back up now to Google Drive (both phones must use the same Google account). On the new Fold, install WhatsApp from the Play Store, verify the same phone number, and when prompted choose Restore so it pulls the Google Drive backup. The Google Drive restore during setup is the cleanest method; a local backup (copying the WhatsApp/Databases folder before first launch) is a fallback if the cloud restore fails. See how others solved this on Reddit

Missing notifications on Samsung foldables are almost always caused by aggressive battery optimization closing WhatsApp in the background. Go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted, then under Settings > Battery turn off extra power-saving modes, and confirm alerts are on under Settings > Apps > WhatsApp > Notifications. Inside WhatsApp, also re-check Settings > Notifications so message notifications are enabled. See how others solved this on Reddit