How do I browse / delete files?

I’ve been using rocket chat for a while and space is starting to fill up on my server. With Slack I could browse the file uploads and delete the large ones but I can’t find an option for that here.

It looks like there is a way I can set up an auto-delete after so many days but some things might be small and useful to look up and others could be big useless video files that I don’t care about.

Storage type is set to GridFS

I’m using version 1.3.2