WhatsApp for Xperia 1 II

The Xperia 1 II doesn't include a built-in app cloning or dual-app feature like some other Android skins, so the cleanest route is to install WhatsApp Business from the Play Store alongside regular WhatsApp; it runs as a separate app and registers your second number. Alternatively you can set up a second user profile under Settings > System > Multiple users and install WhatsApp again there, but the WhatsApp + WhatsApp Business pairing is the most reliable and officially supported option. See how others solved this on Reddit

First clear the app cache via Settings > Apps > WhatsApp > Storage & cache > Clear cache (this won't delete your chats), then reboot the phone. If it still crashes, update WhatsApp in the Play Store and make sure battery optimization isn't killing it: go to Settings > Apps > WhatsApp > App battery usage and set it to Unrestricted. If problems persist, back up your chats to Google Drive and do a clean reinstall, which usually clears stubborn crashes. See how others solved this on Reddit

WhatsApp media saves to Android/media/com.whatsapp/WhatsApp/Media, and the Xperia's Photos app sometimes won't index it if media visibility is off or a .nomedia flag is present. In WhatsApp open Settings > Chats and turn on Media visibility so new downloads appear in the gallery. Then check Google Photos under Library > Folders for a WhatsApp Images folder, or browse directly to that folder with the Files app to confirm the photos are saved. See how others solved this on Reddit

WhatsApp compresses images by default, so in the app go to Settings > Storage and data > Media upload quality and set it to Best quality. To skip compression entirely, send the image as a file: tap the attach (paperclip) icon, choose Document, and select the photo. Because WhatsApp uses its own basic in-app camera rather than the Xperia's camera app, you'll also get sharper results by shooting with the stock Sony camera first and then sharing the saved file into WhatsApp. See how others solved this on Reddit

Choppy in-app video is usually a decode or cache issue, so clear WhatsApp's cache under Settings > Apps > WhatsApp > Storage & cache > Clear cache and reboot. If it persists, let videos finish downloading fully before playing and update WhatsApp in the Play Store. For smoother playback, save the clip to the device and open it in the Xperia's own video player, which handles decoding better than the in-app viewer. See how others solved this on Reddit