Once you connect your frame to WiFi, the app will ask you to grant it permission to access your photos. Make sure you click "Allow" or your frame won't work.
To manually choose individual photos for your frame, open the Aura App and click into Photos, Albums, or People and Pets. Select the photos for your Aura Frame by clicking "Add All" or "Choose Photos." All the photos you have checked will be added to your Added photos in the app.
If you tap "Add All" Aura will automatically filter your photos, displaying the best ones on your frame. If you have added an entire album, person, or pet, any new photos you add to that album or photos you take of that person will automatically be uploaded to your frame.