How can community members get notified of new media added to a gallery?

I noticed in the Notifications settings that when a member is subscribed to a media gallery application, the only notifications that go out to members are when "Comments are made on media I'm subscribed to". Or if I own the Media Gallery I get notified when Media is added to a gallery. 

How can members get notified when new media is added to a gallery that they do not own?

We have several use cases that are very tied to uploading files and sharing external links in Media Galleries. We need members to be able to get notified of new content being shared.