If you need to know how to find files or recordings uploaded in teams, see this document.

To access the files you need to share, log into O365 at: www.office.com/signin.
Select the app launcher icon  and choose OneDrive

Locate the file you wish to share in OneDrive: 

Select the file you wish to share. You can either send a link to the file to the Team of your choice, or you can download the file and directly upload it to the Team.

At this time we recommend downloading and uploading to the new team directly instead of sharing within OneDrive.