Sync'ing Word docs on Onedrive

Using Onedrive with Windows 8. Need to access Word docs created on my desktop on my Ipad.

I can not sync the Onedrive word docs set up on my desktop to Onedrive - permission issue - yet I have signed in, checked account details,permissions till I'm blue in the face.

It will sync non Office docs like PDFs, but not Excel or Powerpoint.

I'm sure a simple solution as I see no other reference to the problem.