3rd party cleaners often ask for permissions that will take control of important functions that come stock on your phone. So they remove or disable security and safety features
2 ways I know of to clear out cache on your phone. This app has the ability to do it under get help: phone care. Or go into phone settings and click battery and device care
Another troubleshooting tip is to clear the gallery app's cache: open device settings>apps>gallery>storage> clear cache/data>soft reset (power phone off, wait a few seconds, power phone back on).