Microsoft Teams Help > Managing files in Microsoft Teams
Files that you share in a channel are stored in your team's SharePoint folder. Files that you share in a private or group conversation are stored in your OneDrive for Business folder and are shared with the people in that conversation
To share files with a team, go to the Files tab at the top of a conversation, and click Upload.
You can also attach a file directly to a message and it will still appear in your Files tab.
Unfortunately, we don't support file library syncing at this time.
The easiest way to send a file in a direct message or channel is to click the paper clip icon in the compose box.
In a one-on-one or group conversation, you can upload a file to your OneDrive for Business and share it or choose an existing OneDrive file. Everyone in the conversation will automatically be given permission to view, edit, and share the file.
In a channel, you can choose to upload a file from your Microsoft Teams, Recent files, OneDrive for Business, or desktop. The entire team will be able to access the file instantly.
Click the Files button to see all your files, which are sorted into the following categories:
The Recent view shows you every Office 365 document you’ve viewed or edited in recent history.
The Microsoft Teams view shows you all the documents that have been created or edited recently within your favorite channels.
OneDrive contains all your OneDrive for Business files.
In the Downloads view, you'll see a list of all the files you've downloaded to Microsoft Teams.
Files that you share in a channel are stored in your team's SharePoint folder. Files that you share in a private or group conversation are stored in your OneDrive for Business folder and are shared with the people in that conversation.