WhatsApp for Xperia 1 VII

WhatsApp uses its own basic in-app camera, which bypasses Sony's image processing and heavily compresses the result, so it never matches the dedicated Camera app on the Xperia 1 VII. Instead of shooting from inside the chat, open the Sony Camera app, take the shot, then attach it in WhatsApp via the gallery/photo icon. For the sharpest result also set Settings > Storage and data > Media upload quality > HD in WhatsApp. See how others solved this on Reddit

WhatsApp always launches its own built-in camera and there is no setting to force it to open Sony's Camera app, so the controls and quality are limited by design. The reliable workaround is to shoot with the Sony Camera app first, then tap the attachment/gallery icon in the chat and pick the photo or video you just captured. This preserves Sony's full image pipeline, and turning on HD under Settings > Storage and data > Media upload quality keeps more detail when you send it. See how others solved this on Reddit

Crashes are usually caused by a corrupted cache or an outdated build, so first clear it via Settings > Apps > WhatsApp > Storage & cache > Clear cache, then update WhatsApp in the Play Store. If it still crashes, force-stop the app, reboot, and make sure WhatsApp is allowed to run in the background under Settings > Apps > WhatsApp > Battery > Unrestricted. As a last resort, reinstall WhatsApp (your chats restore from your Google Drive backup). See how others solved this on Reddit

This usually happens when WhatsApp lacks the permissions or background freedom it needs to route the call to the headset, so first grant Settings > Apps > WhatsApp > Permissions > Nearby devices and Microphone. Then set Settings > Apps > WhatsApp > Battery to Unrestricted so the call screen isn't suspended while the phone is locked. If the accept button still doesn't respond, re-pair the headset under Settings > Device connection > Bluetooth. See how others solved this on Reddit

Missing or quiet WhatsApp sounds are usually a notification-channel or Do Not Disturb issue rather than a system volume problem. Open Settings > Apps > WhatsApp > Notifications and confirm the Messages and Calls channels are on with a sound assigned, then check Settings > Sound & vibration > Do Not Disturb isn't silencing the app. Also set Settings > Apps > WhatsApp > Battery to Unrestricted so notifications and call ringtones aren't delayed or dropped. See how others solved this on Reddit

Sony's aggressive battery management, especially STAMINA mode and Adaptive Battery, can put WhatsApp to sleep and hold messages until you open the app. Turn off Settings > Battery > STAMINA mode and set Settings > Apps > WhatsApp > Battery to Unrestricted to exempt it. Then turn off Adaptive Battery under Settings > Battery so WhatsApp keeps syncing in real time. See how others solved this on Reddit