From November 2021, all apps updated on Google Play must target at least Android 11.

This means WatchMaker Live Wallpaper no longer has access to external storage folder /sdcard/BeautifulWatches where your watches are stored.

Option 1: Re-import all your watches by finding them in the app and downloading them.

Option 2: Using a PC or Mac, copy all files from /sdcard/BeautifulWatches to the new internal storage location /sdcard/Android/data/slide.watchFrenzy.lwp/files