Files that are sent through a chat are first uploaded to Teams. This allows you to view and download files that you have either sent or received at a later time.
While in a chat, click the Files
tab.
All of the files shared by anyone in the conversation are displayed in one place, so you don’t have to sift through a long message history to relocate a file.
Select a file to view command options.
You can download a file, get a link to it, or open some supported file types.