WhatsApp for Vivo Y36

OriginOS/Funtouch OS aggressively kills background apps to save battery, which silences WhatsApp pushes. Go to Settings > Battery > High background power consumption and set WhatsApp to 'Allow', then open Settings > Apps > Manage apps > WhatsApp > Battery and choose 'Allow background activity' / 'No restrictions'. Also lock WhatsApp in the Recent apps screen by swiping down on its card (or long-pressing it) and tapping the lock icon so the system doesn't clear it. See how others solved this on Reddit

This happens when WhatsApp's media folder is hidden from the Gallery or 'Media visibility' is turned off. Open WhatsApp > Settings > Chats and enable 'Media visibility', then check the specific chat (tap the contact name > Media visibility > On). If they still don't appear, go to Settings > Apps > Manage apps > WhatsApp > Permissions and make sure Photos and media / Storage access is allowed, then restart the phone so the Gallery re-scans the WhatsApp Images folder. See how others solved this on Reddit

This is usually a temporary rendering glitch tied to the keyboard or a stale WhatsApp build. First force-stop the app via Settings > Apps > Manage apps > WhatsApp > Force stop, then reopen it; if the bar is still gone, clear the cache from the same screen (Storage usage > Clear cache, not Clear data). Updating WhatsApp from the Play Store fixes most cases. If it persists, try a different keyboard app and set it as default under Settings > More settings > Languages & input > Default keyboard. See how others solved this on Reddit

When the Play Store stalls or errors, reset its data and the underlying Google services. Go to Settings > Apps > Manage apps > Google Play Store > Storage usage > Clear cache and Clear data, then do the same for 'Google Play Services'. Afterward check Settings > Accounts and confirm your Google account is signed in. Make sure the date and time are set to automatic and you have a stable connection, then reopen the store and the WhatsApp update should go through. See how others solved this on Reddit

Newer Funtouch OS 15 / Origin OS 5 builds tighten background-power rules, so after any update WhatsApp's battery and notification permissions often need to be re-granted. After updating via Settings > System update, re-enable WhatsApp under Settings > Battery > High background power consumption, and confirm Settings > Notification & status bar > Manage notifications > WhatsApp is allowed to show banners and play sound. Either OS works fine for WhatsApp as long as you whitelist it from battery optimization. See how others solved this on Reddit

Yes, unsolicited video or voice calls from unknown international numbers are a common scam, so don't answer or call back. Open the call log, tap the number, and choose Block / Report so WhatsApp removes the chat and flags the account. To cut down on these, go to WhatsApp > Settings > Privacy > Calls and enable 'Silence unknown callers', and under Settings > Privacy > Groups set who can add you to groups to 'My contacts'. See how others solved this on Reddit