Converting docs to Office format, when a file with that name already exists, doesn't work

If I have a docx file named “blah.docx”, and a google docs file also called “blah.docx”, both containing different contents, and set Insync to convert google docs files to Office format, then only one is present after a sync. I don’t know what the best way to deal with this is, but the current behaviour seems a bit broken!