Valentin is right, AutoCAD is not Excel, but 2025 version wants to ack like Excel with its new Tow-Users-At-A-Time file sharing settings. Take warning.. I have been going to shut it off because we jumped right into 2025 and never really looked at all the new stuff put into 2025 and File Sharing is one of them. Now if one of your users have a drawing open and lets say the XREF your talking about and another user comes into work and needed to update his section of the XREF, they will be able to Open the ALREADY OPENED XREF and it will not give them a Warning that is it already being used. They will do their work and hit save and exit. If they do not look at the File Explorer Folder they will not notice that the file now has an XREFNAME-USERNAME.dwg file that AutoCAD automatically makes when you open an already open DWG file and save it. We missed several hours of work this way. I got a txt that file is all done and I go in and there was nothing. We investigated the AutoSave location and there was work there, so when I copied it over into the folder where our drawing was, I seen the crazy named file and started to look into why. AutoCAD does not put a Warning on the new 2025 version.
Link to 2025 File Sharing:
https://help.autodesk.com/view/ACD/2025/ENU/?guid=GUID-B8E43815-838F-4255-BD76-FC342A4CDEC9
But, Valentine is correct once again, split the XREF in sections to have others work on. We do that and then I take that work and EDIT COPY over to the Master XREF and do EDIT PASTE TO ORIGINAL. Works great!
Just a side not to Autodesk, wouldn't it be great if AUTOCAD did act just like Excel, Word, Teams, ETC. and many could work inside the same drawing.
Hope this helps!
JRR!