Sync doesn't even Sync! This is a terrible service...

Sync doesn't even Sync! This is a terrible service. Don't waste your money!! When I update a document on one device it does not update on another device. When I emailed customer service they asked me to take photos of each file on each document on each device that did not sync to send them. I have hundreds of documents that did not sync between devices. I told them I don't have time to do this and they said they cannot fix the problem if don't. This product doesn't work!!!