I used an app to hide certain images on my phone and I transferred the image folders from the phone to an SD card. Now it's not showing and the folders are empty :( how can I restore them?
Apps I've seen usually hide the images by changing their format and saving them in hidden folders at some random locations.
You can check the default saving location used by the app in the preferences. Explore the location from a file explorer and backup the file.
Uninstall the app and reinstall it.
copy the backed up files into the default location again.
try unhiding the files again from the app