I wrote the example referenced at the bottom of the article and it has an example of indicating progress to the user. You can see it in app.js here: https://git

I wrote the example referenced at the bottom of the article and it has an example of indicating progress to the user. You can see it in app.js here: https://github.com/carsonmcdonald/direct-browser-s3-upload-example https://github.com/carsonmcdonald/direct-browser-s3-upload-e...