（已解决）You need to define ‘file_storage‘ in your wizard view in order to handle file uploads

from django.core.files.storage import FileSystemStorage
fs = FileSystemStorage(location='/media/img')


class Loopwateradmin(object):

    # 添加数据时候，一步一步提供数据
    file_storage = fs
    wizard_form_list = [
        ("基础信息", ("pointposition", 'imgs')),
    ]