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Firstly, I am aware that there are quite a few questions that are similar to this one in SO. I have read most, if not all of them, over the past week. But I still can't make this work for me. I am developing a Ruby on Rails app that allows users to upload mp3 files to Amazon S3. The upload itself works perfectly, but a progress bar would greatly improve user experience on the website. I am using the aws-sdk gem which is the official one from Amazon. I have looked everywhere in its documentation for callbacks during the upload process, but I couldn't find anything. The files are uploaded one at a time directly to S3 so it doesn't need to load it into memory. No multiple file upload necessary either. I figured that I may need to use JQuery to make this work and I am fine with that. I found this that looked very promising: https://github.com/blueimp/jQuery-File-Upload And I even tried following the example here: https://github.com/ncri/s3_uploader_example But I just could not make it work for me. The documentation for aws-sdk also BRIEFLY describes streaming uploads with a block: obj.write do |buffer, bytes| # writing fewer than the requested number of bytes to the buffer # will cause write to stop yielding to the block end But this is barely helpful. How does one "write to the buffer"? I tried a few intuitive options that would always result in timeouts. And how would I even update the browser based on the buffering? Is there a better or simpler solution to this? Thank you in advance. I would appreciate any help on this subject.

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