Question
Web Album cannot be saved
QED: Updating Adobe CC apps can ruin the whole thing. This time it is to me the very essential Web module, which does allow saving the album at all. Nope: You do not save!
So the Web module allows to compose album normally, but without any reason the saving is disabled and the whole Web module thus useless.
Macbook Pro M1 Max, MacOS Golden Gate 27.0 and Lightroom Classic 15.5.1

