2 Mac's connected to a NAS, File locking not working; both are able to open xlsx file and overwrite eachothers edits.

Jun 11, 2018
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So,
We have a NAS that has 2 mac's linked to it.
When one opens the excel file the other should get a "read only" notification.
but they can currently both open the file at same time and edit, but they overwrite eachother's edits.

Any idea's on what's going wrong? could it be todo with being Mac's?

Edit: Ive come to the realisation after doing some reasearch that the issue most likely is not in the NAS, and i assume it's a problem in excel's file sharing itself.
 
Jun 11, 2018
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No, we are not using Co-authoring, since it's unnecessary in the situation, one user rarely edits, and mainly just reads.