Hi, you can check the Trash in both the My Files and the Google Photos app.
My Files: Navigate to and open My Files, then tap More options (the three vertical dots), and then tap Trash. Navigate to and touch and hold the missing file. Then, tap Restore.
Items will be permanently deleted after 60 days in Trash.
Open Google Photos app > tap Library.
Select Trash > tap Select.
Select photos you want to restore > tap Restore. Tap the pop-up to restore items.
Hi Anelim64, please try the below steps if you think the pictures are hidden in your device.
Make sure the the album is not hidden.
From Gallery, tap More options (the three vertical dots) and then tap Hide or unhide albums. Tap the switches next to any hidden albums to make them appear.
Turn on Show hidden system files.
Navigate and open My Files. You may need to open the Samsung folder to find My Files. Tap More options (the three vertical dots), and then tap Settings.
Tap the switch next to Show hidden system files, and then tap Back to return to the file list. Hidden files will now appear.
Navigate to the folder containing the image files and look for a file named .nomedia. Tap and hold that file, and then tap Delete.