Which version are you using? It works on my end.
There is a bug, videos and photos within groups are not sent. It doesn't work on iOS or Android. nostr:npub1tm99pgz2lth724jeld6gzz6zv48zy6xp4n9xu5uqrwvx9km54qaqkkxn72
Discussion
I was using 1.3.1 (4), I updated to 1.3.1 (8) and it works now. I hadn't noticed that a new version had been released.