You can manually upload any photo or video you see in Finder. (To copy photos from Mac Photos to finder, see this help article.)
To start, go to my.photospring.com and log into your account.
Click Send Photos from the screen below:

Select a Frame to send photos to by checking one or more boxes to the right of the frame:

Select photos or videos to load by either:
- clicking on the
button in the upper left of the page - dragging and dropping photos from Finder onto this page

When you can expect photos and videos uploaded to arrive on the frame
Photos can take from 1-5 minutes to display on screen. We process photos in the Cloud before making them available to the frame for download. Photo processing includes downscaling to our frame resolution, converting to JPG if necessary and making sure no duplicates arrive on the frame.
Videos can take 3-10 minutes to arrive. We process videos in the Cloud before making them available to the frame for download. Video processing includes downscaling to our frame resolution, converting to MP4, if necessary, and downscaling the frame rate if necessary.