Progress Listener code for upload

[Conjuror1279]

Hi, This is in reference to the issue #490. Is there someplace where I can find a code sample for the ProgressListenerBody class, I am not able to understand how to add a progress listener in the above code. The function modifyBeforeTransmit is only called once and doesnot give me the progress about the upload. I've been stuck at this for quite a while, please help me figure this out.

Also, is there a way to receive or generate the presigned url of the uploaded file using this kotlin sdk?

[ianbotsf]

Tracking discussion in #490.