Settings - Storage - Photos & vídeos says I have 582 MB used. But I have no pictures or videos in the internal memory. I actually deleted all of them from the SD card as well after a backup just to see if this changed anything. Nopes.
I have looked in the File Manager, even showing hidden files, and I can't find those mysterious 582 MB anywhere.
I have installed a cache cleaner... Nothing changed.
Does anybody have any idea of where those mystery files are hidding?
Welcome to Android Central! It's probably thumbnails and the thumbnail database. The system will always generate thumbnails for things like your photo galleries, album art, etc. These get stored on the phone, and can start to take up quite a bit of space--it's not unusual for it to get to 750 MB to even over 1 GB. You can use a file manager to delete the thumbnails (the directory is usually /DCIM/.thumbnails, but be aware that the system will keep on creating and saving thumbnails.