bootstrap-flask - bootstrap-flask 的多文件字段处理

Question

我正在尝试让http://fb4demo.bitplan.com/upload使用以下代码：

class UploadForm(FlaskForm):
    '''
    upload form example
    '''
    file = MultipleFileField('File(s) to Upload')
    submit = SubmitField()

{% extends 'base.html' %}
{% from 'bootstrap/form.html' import render_form, render_field, render_form_row %}

{% block content %}
<!--  https://github.com/greyli/flask-dropzone/issues/29 -->
<script type="text/javascript">
    Dropzone.options.myDropzone.headers = {"X-CSRF-Token": "{{ csrf_token() }}"}
</script>
    <h1>Upload Form</h1>
    {{ render_form(upload_form) }}
    {{ dropzone.create(action=url_for('test_upload')) }}
    {{ dropzone.config() }}
{% endblock %}

def upload(self):
        '''
        handle the uploading
        '''
        form= UploadForm()
        filenames=""
        delim=""
        if form.validate_on_submit():
            for file in form.file.data:
                file_filename = secure_filename(file.filename)
                filePath=f'/tmp/{file_filename}'
                with open(filePath, 'wb') as f:
                    f.write(file.read()) 
                size=os.path.getsize(filePath)
                filenames=f"{filenames}{delim}{file_filename}({size})"
                delim="<br/>"
            flash(Markup(filenames)) 
        return render_template('upload.html',upload_form=form)

拖放工作除了 问题 #147 CSRF 令牌处理不清楚但单击提交时文件名不可用。

相反，Filestorage 对象是类型

str: application/octet-stream

如何正确检索文件？