@MelMelx: If you open the Gallery app > Albums > Tap the 3 dots in the top right > Hide or Unhide Albums, can you see an option to unhide the missing albums? If not, tap the 3 dots in the top right once again > Recycle Bin, and check to see if the images have found their way in here. If they have, press and hold on a file to select it, then select any other files you'd like to recover, and hit 'Restore'. If you have a Samsung Cloud backup, tap the 3 dots > Settings > Sync With Samsung Cloud > On, to see if you're able to recover the images in this manner.
