Thanks a lot for this--it took me a while but I got it working.

For some reason, the :on-start key doesn’t seem to work the same

But using :start as in your manually-call-dataloader-example works

never mind, I understand now: old :start is now :on-start, and :start is the synchronous handler. Got it :)

@sooheon did the issue go away?

Yes, it’s fixed

Awesome :)

Thanks a ton, all the detail in the answers are very helpful