WhatsApp for Poco F6

On HyperOS, WhatsApp's own notification channel can stay louder than your per-chat mute, so you need to check both layers. First open the specific chat in WhatsApp, tap the contact or group name at the top, then tap Notifications and turn on Custom notifications (or use the Mute option) to silence that thread. Next go to Settings > Apps > Manage apps > WhatsApp > Notifications > Messages and confirm the channel's Sound is set how you want. If sound persists, open Control Center and toggle Do Not Disturb off and back on, since HyperOS can leave DND in a stuck state after an update. See how others solved this on Reddit

This is almost always HyperOS battery management killing WhatsApp in the background. Go to Settings > Apps > Manage apps > WhatsApp, open Battery saver and set it to 'No restrictions', then go back and turn on Autostart for WhatsApp. Next open Settings > Apps > Manage apps > WhatsApp > Notifications, make sure notifications are allowed, and check Settings > Lock screen to confirm it isn't set to hide notification content. After that, locked-screen banners should appear normally. See how others solved this on Reddit

When the banner appears but stays silent, the WhatsApp notification channel has usually lost its sound assignment, often after a HyperOS update. Go to Settings > Apps > Manage apps > WhatsApp > Notifications > Messages and re-select a Sound, and make sure 'Floating notifications' (banner) is enabled. Also check your ring volume under Settings > Sound & vibration and confirm Silent mode or a scheduled Do Not Disturb isn't active in the Control Center. See how others solved this on Reddit

This usually happens when WhatsApp's 'Media visibility' is off or HyperOS hasn't re-scanned the folder. In WhatsApp go to Settings > Chats and turn on 'Media visibility', then grant full storage access under Settings > Apps > Manage apps > WhatsApp > Permissions > Files and media. The files live in Internal storage/Android/media/com.whatsapp/WhatsApp/Media and stay there even when hidden, so if they still don't appear in Gallery, reboot the phone to force it to re-index that folder. See how others solved this on Reddit

Disappearing media is usually a sync or permission issue rather than true deletion, so first re-grant full file access under Settings > Apps > Manage apps > WhatsApp > Permissions > Files and media. Use the Files app to check Internal storage/Android/media/com.whatsapp/WhatsApp/Media, where the originals normally still sit. If they are genuinely gone, restore from your Google Drive backup by uninstalling and reinstalling WhatsApp from the Play Store and tapping Restore during setup, using the same Google account and phone number that created the backup. See how others solved this on Reddit

Start by clearing only the cache: go to Settings > Apps > Manage apps > WhatsApp > Clear data and choose 'Clear cache' (not 'Clear all data', which wipes local chats). Then update WhatsApp from the Play Store, since crashes often follow an outdated build on a newer HyperOS version. If it still freezes, set WhatsApp's Battery saver to 'No restrictions' and temporarily turn off Memory extension under Settings > Additional settings > Memory extension. As a last resort, reinstall WhatsApp and restore from your Google Drive backup. See how others solved this on Reddit