For Windows: If you are trying to co-author, check the file name of the file and make sure it is in either .xlsx, .xlsm, or .xlsb format.If the file is in another format, go to File > Save As > Browse > Save as type and choose the .xlsx, .xlsm, or .xlsb format.. For Mac: If you are trying to co-author, check the file name of the file and make sure it is in either .xlsx, …
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