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Thanks for your feedback!Lisa commented
It's absolutely critical to be able to re-name the "General" channel. Ambiguity is the route of all IT evil. Also, whilst its great that you can add new tabs to channels to include other Sharepoint Libraries, it's impossible to place those libraries under the Files tab. Creating a new folder in files, simply adds another folder to the "General" folder under the primary document library. This encourages poor library and folder structure as Teams Generate folder after folder to ensure that each channel shows the correct files; leading to exceeding library list limits and resulting in poor performance. At least allow for the deletion of the Files Tab from a Channel.