@Richard
Did the results of my tests with various types of soft font (on LJ M475) reassure you at all?
@Dennis
I agree that zipping the files would have allowed all the files to be added in one go.
But the first five files were very small (so no real size advantage in zipping), and I'd already added them when I found that I couldn't add any more.
... and placing files in a .zip adds an extra step for subsequent readers, which may put sometimes put them off looking at the files.