Hi Leighj,
After doing more research, I found the following help article should come in handy:
I can’t use the SkyDrive client to sync documents
http://office.microsoft.com/en-us/mac-powerpoint-help/i-cant-use-the-skydrive-client-to-sync-documents-HA104033812.aspx?CTT=1
I suggest you upload documents to SkyDrive Pro by following the article. If you have any further questions, please let me know.
Thanks,
Evan Zhang