Welcome to the Roku Community, @Mad_Bohemian!
We appreciate your interest in using the Backdrop app to stream your photos on your Mac computer.
Please note that you can look them up using the official website, and if you try to use them as a screensaver or wallpaper on your computer, unfortunately, we don't currently support that.
However, you could save the photos to a file on your Mac and set them up that way. Therefore, we recommend contacting the Official Apple Support team to discuss other options or suggestions they may have.
If you have any further questions or concerns, please feel free to ask.
Thanks,
Chel
Jecheal R.
Roku Community Moderator
