Sharing photos from iCloud
iCloud photo sharing allows for the creation of "web albums":
https://support.apple.com/en-us/HT202786
Since Pix-Star frames are able to access photos from web albums, an album shared with Apple Photos and the "publish to website" option turned on should be able to be read by the frame.
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Rick Bishop
shared this idea
No it is not working with iCloud, there is no way to access pictures thee if you are not from Apple or and Apple device.