A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Hi Jordan,
I suppose you are using the legacy shared workbook feature via Review > Share Workbook. please check the link, see if you are experiencing the same thing.
network drive - Why duplicate excel files are created when saving a shared file - Stack Overflow
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If you are a Microsoft 365 subscriber and if it is convenient and suits your requirement, we highly recommend co-authoring, which is the replacement for Shared Workbooks.
Regards,
Neha