Generally what works for me is to use WiFi instead of cellular data.
I can't yet post links, so I just give the description. Both threads are here in the Windows Central OneDrive forum. And I also noticed another thread by akthelonelyman from 04-29-2015 asking about the same problem. I myself started a thread here about it on 03-29-2015.
I think it's a common problem with the WP (8.1) OneDrive app and cellular data.
