What's annoying is that synchronisation does't work for google slides or google docs. They are just synchronized as links to the webpage on my computer.
If you use Insync you have the option of converting to DOCX or ODT.
Insync has other issues though, my "sourcetreeconfig" is being downloaded as "sourcetreeconfig.xml".
Not 100% on that, but I think you can save these documents on Google Drive, and then they're treated (and synced) just like any other files.