Simultaneous updating Excel file

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I have a large Excel Workbook called KRS. I use a MAC but others who will share have a PC.  We are running Office 365 2016.  I need 3 people to be able o access and update the file together.  My workbook has many MACROS and is larger than 30MB which means it cannot run on Excel Online.  I also have one other Excel Workbook , MONEY, which pulls data from KRS and that each of us needs to use together.  How can I allow all 3 of us to share and make changes to the workbooks at the same time? The MACROS are critical! Thanks for any suggestions. 

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