Bulk add to photos app

I use nextcloud a lot to send groups of stills - in 24 i would just copy a public link, change to icon view, and re-copy the URL with the added icon view option, and that worked. That doesn’t work in 25 anymore - but the new photos app albums work great!

The only problem is - I cannot for the life of me figure out how to add a big batch of photos from a folder into it. I can check them one by one, but shift clicking the photos or the checkboxes does nothing. Is there a way to create an album from an existing folder?