Documentation regarding progress

The documentation on upload progress is very sparse : "Note that both putFile and putStream will stream to S3 instead of reading into memory, which is great. And they return objects that emit 'progress' events too, so you can monitor how the streaming goes! The progress events have fields written, total, and percent."

Would it be possible to provide and example using putFile or putStream?

Start by locating the documentation that describes upload progress for putFile and putStream, then review how those methods emit progress events. Add a runnable example showing progress handling and the written, total, and percent fields; the documentation is done when a reader can monitor an upload from the example.

Written by the indexing model from the issue text.