Use "File Manager" with option "Show hidden files" to search a folder file ( .safebox)
If you find that folder, select all the files in that folder and choose option to hide. Now open hidden folder in File Manager; Swipe down until you see padlock icon > input fingerprint or pattern code > select all hidden files, then tap "Unhide" > select the folder to put that files and then tap "Unhide".
Now you can see all files in the selected folder that you save that files