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Google Photos will no longer sync with third-party digital photo frames
(www.theverge.com)
This is a most excellent place for technology news and articles.
I dumped Google photos for self hosted immich and it's been great. Not sure if it has the ability to connect to photo frames but if you already self host anything else it's not too much work to setup.
This is the way.
Check out Immich Kiosk as an example for image frames.