Secret Photo Vault - VLTR

So I got into the app and I added a few photos to see if it worked, but when I got out I was not able to figure out how to add more photos. Can someone please explain to me how to do this because it is a GREAT app and I really want to be able to use it, because I downloaded many other apps like this and deleted the all so when I finally found this game it worked but now I can’t tell how to add more photos. Please someone explain to me how to do this. THANKS! Great game.

When you open the app the face id pop up show at the same time together with the password ui i think it needs to be fixed and my suggestions is it should open with face id and when faceid didn’t work the password ui can pop up then am texting on iphone 11 (ios17.2) thanks

When I download it on another device can I still get my files