[oXygen-user] save to URL give 405 not allowed

I have some schema posted on my (bluehost) website under public_html. If I try to use oxygen to edit these files directly, I can open them, and make changes in the GUI, but then when I click Save (or Save to URL) I get the Error 405 not allowed. It could be something about the way the host server is set up, which I have little control over. But I have been able to directly edit files on this website from other programs (in particular PSPad). My current workaround is to maintain a local copy and upload using Filezilla. Any suggestions? Tara