According to the development page, uploading splits files is "in beta" - but I don't see an obvious way to do this from the usual Add Race sequence. What am I missing?
You need to export them as IOF xml and send them to me.
Thanks. Would you consider it a burden if I did this regularly for our local events? (every 2-4 weeks in spring and fall.)
Not at all, it's pretty easy. and if your files seem to import smoothly I will give you access to do it yourself.