WhatsApp for Oppo Find N2 Flip

ColorOS aggressively suspends background apps, so WhatsApp has to do heavy catch-up syncing each time you reopen it, and that burst of activity shows up as high battery use. Go to Settings > Battery > tap WhatsApp (or Settings > Apps > App management > WhatsApp > Battery usage) and set it to 'Allow background activity' / 'Don't optimise', then under Settings > Battery > More settings turn off 'Sleep standby optimisation' for WhatsApp. This stops the constant resync cycle and usually levels the drain back out. See how others solved this on Reddit

This is ColorOS battery management killing WhatsApp in the background so push messages can't wake it. Open Settings > Apps > App management > WhatsApp > Battery usage and choose 'Allow background activity', then go to Settings > Apps > Auto-launch (Startup manager) and enable WhatsApp so it can restart itself. Finally, lock WhatsApp in the Recent apps screen (open recents, tap the card's menu, select Lock) so the cleaner won't close it. See how others solved this on Reddit

By default ColorOS only mirrors a limited set of apps to the cover screen, so WhatsApp may not appear there until you enable it. Go to Settings > Cover screen (or Settings > Special features > Cover screen) > Cover screen apps and toggle WhatsApp on so you can read and reply to messages without opening the phone. Once it's added you'll get message previews and quick replies on the front display. See how others solved this on Reddit

WhatsApp on Android backs up to Google Drive, not to Oppo's cloud, so back up first on your old phone via WhatsApp > Settings > Chats > Chat backup > Back up. On the Find N2 Flip, install WhatsApp from the Play Store, verify the same phone number, and when prompted sign in to the same Google account to restore the chats and media. The restore option only appears if you use the same phone number and the same Google account that holds the backup. See how others solved this on Reddit

Failed downloads usually point to a storage-permission problem, while received media looking soft is mostly WhatsApp's normal compression rather than a phone fault. First, in WhatsApp go to Settings > Storage and data > Media auto-download and enable Photos/Videos for Wi-Fi and mobile data so files actually save. If media still won't download, check Settings > Apps > App management > WhatsApp > Permissions and confirm Files and media (storage) access is allowed. To avoid compression on files you send, share them as Document instead of from the Gallery. See how others solved this on Reddit