I’m new to this back and forth thing, and I CANNOT for the life of me get scrvx files to sync with my iPad Pro. They are in the the folder but every time I try and down load I get a missing files warning. Not having a good day. 
You have to put the whole project.scriv folder in Dropbox, not just the .scrivx file!
Mark
If you’re just transferring .scrivx files, that’s your problem. You need the entire .scriv folder, including subfolders.
Guide to setting up synchronization here:
scrivener.tenderapp.com/help/kb … g-with-ios
Troubleshooting tips for common problems here:
scrivener.tenderapp.com/help/kb … os-syncing
Katherine