David,

Thanks very much for your help, it works nicely now. When I look at
your code it all looks so obvious and easy, perhaps one day it will be
like that for me too. Certainly having your examples helps my
understanding enormously; I really appreciate it.

I will continue to look at the upload_both, create_both,
getNextFilename, to see if I can come up with a fix. I'm afraid it's a
bit over my head, but you never know. As my grandfather used to say,
even a blind squirrel stumbles upon an acorn now and then. Wish me luck.

Best,

Brett