No, not even an error message. But now it's a little more clear: 1) getFilenames() doesn't exist in JBatchUpload. I have looked at the sources, there is simply no implementation. 2) Callbacks didn't work on my workstation, but worked on a different system, so it's my system that's slightly messed up...

Can I get JSAPI source code too please?

I've been trying to use it with JBatchUpload - no go. Is there a way?