WhatsApp for Samsung Galaxy S20 Plus

One UI's Dual Messenger creates a cloned WhatsApp, but the clone needs its own permissions granted separately. Go to Settings > Apps > WhatsApp (the duplicate with the orange badge) > Permissions and enable Contacts, Files/Storage, Microphone and Camera, then make sure the clone isn't being put to sleep under Settings > Battery and device care > Battery > Background usage limits (remove it from Sleeping/Deep sleeping apps). Also note that the cloned app must register with a different phone number than your primary WhatsApp, otherwise activation will keep failing. See how others solved this on Reddit

The cloned WhatsApp saves media to a separate folder, and it needs full file access to write and have those files indexed. Open Settings > Apps > WhatsApp clone > Permissions > Files and media and choose 'Allow management of all files', then in the WhatsApp clone go to Settings > Chats and turn on Media visibility. Because the clone stores media in its own Dual Messenger folder rather than the standard WhatsApp Images folder, restarting the phone (to force a media re-scan) usually makes the new files appear in Gallery. See how others solved this on Reddit

This is almost always a revoked permission or a conflict with another app still holding the camera/mic. Go to Settings > Apps > WhatsApp > Permissions and confirm Microphone and Camera are set to 'Allow only while using the app', then force stop WhatsApp and clear its cache under Settings > Apps > WhatsApp > Storage. If the rear camera still fails, restart the phone to release the sensor from any background app, and update WhatsApp via the Play Store since older builds had S20 sensor bugs. See how others solved this on Reddit

WhatsApp uses its own in-app camera, which on the S20 series can latch onto the wide-angle lens instead of the main sensor. The reliable workaround is to skip WhatsApp's built-in camera: tap the attachment (paperclip) icon, choose Gallery, or open the stock Samsung Camera app, take the photo with the correct lens, then share it back into WhatsApp. Keeping WhatsApp updated helps, since later versions improved lens selection on Samsung devices. See how others solved this on Reddit

This usually points to battery optimization throttling WhatsApp in the background plus a slow Google Drive sync. Go to Settings > Apps > WhatsApp > Battery and set it to 'Unrestricted', and remove WhatsApp from any sleeping-apps list under Settings > Battery and device care > Background usage limits. For backups, open WhatsApp > Settings > Chats > Chat backup and back up over Wi-Fi only, making sure the linked Google account has free Drive space, since a full or wrong account stalls the process. See how others solved this on Reddit

When the sound vanishes but banners still appear, the notification channel has usually been reset or silenced by One UI. Go to Settings > Apps > WhatsApp > Notifications, open the Message notifications category and re-select a Sound under it, and confirm the channel isn't set to Silent. Also check that Do Not Disturb isn't active and that WhatsApp isn't in the Sleeping apps list under Settings > Battery and device care, both of which can mute its alerts. See how others solved this on Reddit