Is there a way to view a list of all the files that people have uploaded/attached to a channel? Perhaps even through the search feature or a slash command? Or maybe there's a simple plugin that adds this functionality?
As a comparison, this is a basic feature of HipChat and Slack, but I don't see it in Mattermost. I'm trying out Mattermost Team Edition version 3.6.2. But for the most part, Mattermost is a great and most welcome app.
Mattermost currently (version 3.6) does not have any feature or API endpoint to allow listing all attachments in a channel, nor any way of searching for messages with attachments, so this currently isn't possible.