Mail merge using Office 2016 on MAC and merge data on Windows 7 file share

We operate a mixed network of computers, largely PCs with one MAC running High Sierra.  The MAC is new and runs Office 2016.  When we try and mail merge from Word 2016 on the MAC, the computer seems to be refusing to access the merge data .CSV file, saying there's no data at the end of the merge wizard screens.  I've Googled the problem and the most often found solution is that the Apple Sandbox is refusing access to the .CSV file (which is in a shared folder on a file server running WIndows 7).  Is there a way to mark the entire file share folder on the PC as safe?
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