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But does this mean Javascript is talking to your server rather than S3?

Because the beauty of filepicker is that a user is not locking up one of your processes while they spend minutes uploading a file.

Especially important on Heroku, for example. Though I'm sure a self hosted node server could fare better, I'd sooner stick it out with Filepicker.

No... the file goes directly to S3 from the browser. Your server is only pinged with the _name_ of the file so the upload can be signed.

You construct the form server side but the file is uploaded from the client to S3 directly without passing through your server. It has been the best way to upload files to the internet for a long time.

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