Why is Flask not receiving my POST Blob?

Question

My problem is that I'm sending a Blob to the server with FormData, but the server isn't getting it. Code looks like the following:

Flask server code:

@app.route('/save-record', methods=['POST'])
def save_record():
    app.logger.debug(request.form.keys()) #Shows only the title key, not the file key

Client JS Code:

var save = function() {
    var form = new FormData();
    form.append('file', record.blob, record.filename);
    form.append('title', searchedObj.title);
    //Chrome inspector shows that the post data includes a file and a title.                                                                                                                                           
    $.ajax({
      type: 'POST',
      url: '/save-record',
      data: form,
      cache: false,
      processData: false,
      contentType: false
    }).done(function(data) {
      console.log(data);
    });

Answer 1

Check request.files for the file.

@app.route('/save-record', methods=['POST'])
def save_record():
    app.logger.debug(request.files['file'].filename)