I have created this shared album just to repro the issue:
When I paste
https://www.icloud.com/sharedalbum/#B0g532ODWJGfAxx into Kinopio, it arrives as
When you visit the link, you get “iCloud can’t find that page”:
If you remove
?hidden=true, then it works.
I wonder if other sites also have this broken parsing around extra querystring params?
Could you hide “source URLs” in Kinopio without modifying them, using app state only?