Use the WP media uploader dialog for uploading a form attachment (non-admin). Offering progress and drag and drop feedback

Disclaimer: I guess it’s not a real answer and has way to much outside links, but it just won’t fit into the comment format. So this can be considered to be just for information purposes.

I guess this

uses about what you’ve already tried.

But there are possibilities, so you might just have to read a little bit more

For additional sources take a look at

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