Some files do not get caught by insync, and do not sync to Google drive.
They do not get the green circle, they do not show up in the drive web client.
When I save a file in blender, it is set to auto backup. (Blender is a free 3D package)
It renames the old version from .blend to .blend1, then saves the new .blend file.
Insync catches the .blend to .blend1, but then misses the save to the new .blend
In Explorer the
.blend1 has a green checkmark
.blend does not have the green checkmark
Also it seems to miss deleting the old .blend1 files, they keep piling up in drive.