Upload files from <input type=file> with the download request

[Mumpitz]

I am missing the files selected in an <input type="file"> element. Sending the form regularly, send the files and i can access them in my python flask server via request.files.getlist('file'). This one is empty now with jQuery.fileDownload. I suspect that they are not sent with the request.

Is there a solution i am missing or is it simply not implemented?