Use APKPure App
Get Invisibles old version APK for Android
Take pictures with a special camera that will save them in invisible folders
You can take your special pictures with an even more special camera that will save them in “invisible” folders.
Only you will know the name you gave to the folders, and only you will use such name to ask the app to let you enter again in an invisible folder.
In every folder you can save different photos, enjoy!