To choose specific photos and videos, first, plug in the datalogixx. It should open the Mo disk app for you, and you accept all permissions. You choose the first option on the app which is called backup photos and videos. Then you choose add wonderful moments. From there, you should be able to select the ones you want to be backed up. Once you have them selected, you hit the blue backup button on the bottom of the screen.
Mine then asks me to name a new album for them. Once you named the album, click okay and they will start to be backed up.