If I submit a file in Downloads, for example, it creates a topic and the topic is unread. Since topic is created dynamically with the same title/content of the file, it should be marked as read so it doesn't show up in the unread stream for the file submitter.

Tks.

Sounds like an oversight to me, I have committed a change for this. Upon review from the rest of the development team the change should be included in an upcoming release.