Google Drawings *also* doesn't work for me, because it won't draw with my tablet. The "scribble" tool is incredibly laggy with the mouse, too.
How is it so difficult to find this kind of basic functionality in handwritten notes? I feel like I'm being unreasonable, almost.
I've resigned myself to the cloud storage solution, using the .PSD file-type so that it can be edited on-the-go. It's an incredibly cumbersome solution, but at least it satisfies all of my needs.