What do I do to upload photos to ICloud from a non Widows PC?
What do I do to upload photos to ICloud from a non Widows PC?
Assuming this is a Chromebook or other non Windows, non Apple PC, log in to https://icloud.com on a web browser, and use the upload facility in the Photos App to upload them.
click here ➜ Upload and download photos using iCloud.com - Apple Support