After creating and sharing a Shared Album, I cannot re-share it or add more subscribers. All the email addresses are greyed out and selecting them and hitting return seems to delete them from the shared list. The Shared Album doesn't seem to remember that I entered new subscribers if I navigate away from the album in question. On returning to it, the new email addresses I added are gone (they don't "take").
Furthermore, the original subscriber also has a ? next to her email address now.
What is going on?
I find the Sharing feature of Photos very clunky and not intuitive to use generally speaking.