Adobe has never supported Macs working directly off a server. If you contact Adobe Support with a problem saving or opening files on a network file share, they will promptly dismiss the issue and point you to one of their related “don’t work off a server” support articles for Illustrator, Photoshop, or InDesign.
Now we all know that most Mac based creative departments that use Adobe apps also work off some type of server, and this type of workflow is considered the norm even though Adobe doesn’t support it.
Adobe has recently taken this a step further, adding “Illustrator does not support network or removable drives as scratch disks, or folders of file sync services such as Dropbox and Google Drive.”
I don’t see the logic to this, because files saved in a synced Dropbox or Google Drive folder are local to the Mac, but it’s worth noting that Adobe doesn’t support it.