Back-up your photos

Any idea how to make the app back-up your photos on the Samsung Galaxy 9S?

I have deleted the app and reinstalled it on my phone. I have also turned off and on the “auto-backup” feature in the app and it seems to not be working.

This happens on both my and wife phones. Do you know anything else I should try before considering it broken? My wife has the Beta version and I installed my phone four times now.

Also Do I have to use My cloud home app or is there a 3rd party app.

Thank you for your input!