WhatsApp for OnePlus 6

Android 11 changed how apps access storage, so first open Settings > Apps > WhatsApp > Permissions and make sure Files and media (or Storage) is set to Allow. Then go to Settings > Battery > Battery optimization, find WhatsApp and set it to Don't optimize so background media downloads aren't killed. If photos still won't save, clear WhatsApp's cache (not data) under Settings > Apps > WhatsApp > Storage and confirm Settings > Apps > WhatsApp > Storage shows media is being written to the right location. See how others solved this on Reddit

This update tightened Android 11's scoped storage and OnePlus's aggressive background app management, which can break WhatsApp media saving and notifications. Re-grant Files and media under Settings > Apps > WhatsApp > Permissions, disable battery optimization for WhatsApp in Settings > Battery > Battery optimization, and turn off Deep optimization / Sleep standby optimization in Settings > Battery so the app isn't put to sleep. If glitches persist, back up your chats to Google Drive and do a clean reinstall. See how others solved this on Reddit

WhatsApp's iPhone backup lives in iCloud and Android can't read it directly, so there's no simple drag-and-drop. If both phones support it, use the official WhatsApp 'Move chats to Android' flow (a wired transfer started from the iPhone during the OnePlus's WhatsApp setup); older iPhone/iOS versions may not offer it. Otherwise a paid migration tool such as Wondershare MobileTrans or Dr.Fone can move the chats. Either way, first email or export your most important conversations as a fallback, since transfers can fail. See how others solved this on Reddit

WhatsApp's in-app camera uses a basic capture pipeline that ignores the OnePlus's full camera processing, so shots look soft and grainy. Instead of tapping the shutter inside the chat, take the photo with the OnePlus stock Camera app, then in WhatsApp tap the attachment/gallery icon and pick it. To preserve full resolution, send it via the attach Document option; sending normally still compresses it, but a stock-camera photo will look far better than the in-app camera. See how others solved this on Reddit

This is a known OnePlus 6/6T behaviour: when an app like WhatsApp holds the microphone, the phone forces connected Bluetooth headphones into the low-quality call profile (HFP/SCO) instead of the high-quality media profile (A2DP), so all audio sounds muffled. There's no official toggle to fully fix it; workarounds are to fully close WhatsApp in the background after a call so the phone switches back to A2DP, or to listen on wired/phone-speaker output. Make sure OxygenOS is fully updated, as later patches improved this handoff. See how others solved this on Reddit

This is usually a microphone permission or proximity-sensor/cache problem. Go to Settings > Apps > WhatsApp > Permissions and enable Microphone, then clear the WhatsApp cache under Settings > Apps > WhatsApp > Storage. If playback cuts out, note that the proximity sensor switches to the earpiece when you cover the top of the screen, so keep it uncovered for speaker playback, and make sure Media volume (not just ringtone volume) is turned up. See how others solved this on Reddit