Django: Does filepicker.io use passthrough or direct approach?

Question

After reading this article on heroku, I've decided that I want to use a direct upload approach with my django project to allow users to upload files directly to my amazon s3 bucket.

According to their docs, filepicker.io (along with the django-filepicker plugin) seems to integrate well with amazon s3, but it is unclear whether or not filepicker.io uses a direct upload approach or pass-through approach.

Which does filepicker.io use?

Answer 1

From their home page.

Your files are stored in your existing S3 bucket. We handle all the complicated javascript and backend APIs to give you a clean and elegant way of saving files directly to your S3 bucket.

Since they fallback to Iframe embedding, It's likely that the "upload" will go through their server before ending up in your bucket. But that's bandwidth that you don't have to pay for.