Upload and Share Files
Wherever you are in Teams, look for the little paperclip icon. This allows you to attach a file. Alternatively, you can:
Go to the Files tab.
Select your file or files from device computer or OneDrive for Business account.
Find and Filter Files
You can filter files to find your recent documents, ones that have been created or edited in your channels, or downloaded to your computer.
Select Files and choose a filter:
Recent: Recent files you’ve viewed or edited.
Microsoft Teams: Files created or edited across your channels.
Downloads: Files you’ve downloaded from Teams. Select Open Downloads Folder to find them.
OneDrive is connected by default. If you’d like, choose another cloud storage provider to use in Teams.