I don't know if it can be updated in mobile now.  The arrows are in the lower right corner to shift to the notes.  If my keyboard icon is up, I can't shift to the notes.  If I take the keyboard away, I can shift, but then I can't get the keyboard icon to return to make changes.

My collection isn't stored near my computer.  I would like to use my PPC to make notes and then update them to the computer.