Files & Media
Click Files & Media in the sidebar. The library has tabs for All, Media, Files and Links. Filter by who added something, by chat, or by what DIA made, and sort by date, name or size. Grid and list views are both available.
Upload adds a file to your Private files, where only you can see it.
File details
Click a file to see its details. From there you can use Show in chat and Download, see earlier versions and restore one, and check who has access and the scan result.
A file in a Shared chat is visible to everyone in the workspace. Delete appears only for your own files that were never sent in a chat.
Files in a chat
Once a chat has a file, Files appears in its header with a count. It opens a side panel for that chat's files. Pictures open in a viewer, and the arrow keys move between them.