In this example, I had a copy of the file open and another member tried to check it out but received an error message: To check out the file, no one can have the file open.In Teams (also works if open and viewing as a SharePoint list in a browser tab), click the three dot menu next to the file name to show the Action options.The ability for everyone to access the file, and collaboration of everyone working in the same file, at the same time, is amazing! BUT, if you want to prevent people from editing a file while you finalize it, or use it for a meeting, the Teams “Check Out” file feature is the solution! When working on files hosted on a Team, anyone in the organization with access to the Team can make changes to the files.
