The "share images from Flickr" option correctly identifies user, user album, and user gallery links as "select all the files from here".

https://www.flickr.com/photos/britishlibrary/ > tries to import all images from the user (but limits to first 500?)

https://www.flickr.com/photos/185225596@N02/galleries/72157711542166091/ > tries to import all images in the gallery

https://www.flickr.com/photos/britishlibrary/albums/72157672074712488 > tries to import all images in the album

https://www.flickr.com/photos/britishlibrary/tags/sysnum000077405 > tries to import all images from the user, rather than that user's tag

https://www.flickr.com/photos/tags/sysnum000077405 > seems to time out

So user/albums/..., user/galleries/... both work OK, but user/tags/... falls back to being treated as "all user's pictures" and a general tag search fails.

I appreciate that "try to select all files with a specific tag across all of Flickr" is probably undesirable, but some users (especially large-scale uploaders like the BL example above) use tags systematically rather than albums - would it be possible for user/tags/... to be supported for selecting groups of files?