From Teams on the desktop or web, you can download any file you see in Teams—whether it’s on a channel’s Files tab, sent in a message, or stored in a OneDrive folder.
Select More options next to the file name and then Download.
Files you download from Teams will show up in your device's Downloads folder. (Currently, the download location can't be changed.)
View Teams files
Select Files on the left side of Teams for easy access to all your Teams files. For details, see Explore the Files list.