To start the collaboration process, you'll need to add files. In your team, click on Files to get started and then follow the directions provided below.
Adding Files to Teams
Create File in Teams
You can create an Office document directly in your team. To do so, click on the New button and select the file type you'd like to create.
Upload a File
You can upload files of all types to Teams. To do so, click on the Upload option from your Files section. A file explorer window will open for you to find and upload your desired file or files.