How to select OneDrive Pictures folder to publish photos

I am trying to publish some of my photos to OneDrive for sharing.  Unfortunately, when I click the OneDrive publish button, it doesn't allow me to select my OneDrive "Pictures" folder.  In fact, none of my folders show up, though it will allow me to create a new folder.  But even then, it won't let me create that folder within a folder, it just creates a new folder in the root of my OneDrive.  How do I get Photo Gallery to publish my Photos into my Pictures folder, or a folder of my choosing?  I must be missing something obvious.