iCloud. Photos from photostream vs shared albums
If I want to free up space in my iCloud and delete iCloud-photos. Does this remove photos in shared albums aswell? Or are they unaffected?
From my dubious experiences across shared items that used iCloud
(and iCloud+) be aware and keep an Offline Archive ~ well away from
those any other Apple products share Online.
They can be completely & easily obliterated when automatically accessed.
Details and scruft shared also disappear when detailing with iCloud. Even
should you not actively use iCould Drive; that animal has related traits.
What's the difference between device storage and iCloud storage? - Apple Support
Treat those items with scrupulous attention; with different angle of approach.
Manage your iCloud storage - Apple Support
Back up your items; and learn how to backup offline, too; some items
may not lend themselves to standard backup practices; be innovative.