So I bought DEVONthink to go. I created a smart group: “EVERYTHING” in my Mobile Sync folder in DEVONthink Pro Office that matches everything (file size >= 0).
Then I sync with my IOS device. Nothing gets synced.
I create a file on my IOS device, then sync. Yes, it get synched back to my Mac.
Create a new file on my Mac. It gets into my EVERYTHING smart group. Synch again. Nothing uploaded to IOS. Only file is the one created on IOS.