Initially, all photos sent by email addresses automatically go to your Emailed Photos Playlist which is automatically assigned to your frame.
You can make a copy of these photos into a different playlist if you want to.
Please see the steps below along with photos for reference.
1. Log in to app.nixplay.com. Go to Photos tab > Content Library. Locate the album with your @mynixplay.com address name. Click into that album.
2. Hover your mouse on top of the photos and click on the checkmarks for them to turn green. Click and drag the photos to the preferred playlist on the right panel. Drop the photos and hit Save.