Can't load books or attach documents from my pc

Hey guys, I can't load books or attach documents to emails from "my pc", this also happens trying to open docs in office etc,, it will only do it from onedrive, which is all set to offline online, which is not very convenient. Does anybody have any idea what is going on? If I click on "my pc" it shows the folders, but then when I try to open one it won't do it, but onedrive, no problem. Any help is greatly appreciated