Python 从django服务器上载时，Firestore存储未显示映像

我的问题是，当我将图像上载到firestore存储时，它正在被上载，但当我打开图像时，会出现404错误： “在服务器上找不到请求的URL。”

我把代码包括在下面

我已经尝试了从文件（）上载、从字符串（）上载和从文件名（）上载， 但似乎什么都不管用

views.py

import PIL
from django.core.files.storage import default_storage
from django.core.files.base import ContentFile
from django.conf import settings

@login_required
def create_event(request):
    form = EventForm()
    if request.method == "POST":
        form = EventForm(request.POST, request.FILES)
        if form.is_valid():
            print("my form dynamic details  ", request.POST)
            print("my files ", request.FILES['cover_image'])
            path = default_storage.save(
                'tmp/'+request.FILES['cover_image'].name,
                ContentFile(request.FILES['cover_image'].read())
            )

            of = open('media/tmp/'+request.FILES['cover_image'].name, 'rb')
            print("my of ", of)

            # I have tried all the methods below but doesn't work at all.
            blob = bucket.blob(request.FILES['cover_image'].name)
            blob.upload_from_file(of, content_type="image/jpeg")
            # blob.upload_from_string(request.FILES['cover_image'].name, content_type="image/jpeg")
            # blob.upload_from_filename(filename='media/tmp/'+request.FILES['cover_image'].name)
            print(
                "File {} uploaded to {}.".format(
                    request.FILES['cover_image'].name, "jigarfile.jpg"
                )
            )

            return redirect('create_event')
        else:
            print("my erros ", form.errors)
    return render(request, 'user/events.html')

下面我附上图片

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不幸的是，这种错误很难重现。另外，使用上下文管理器来处理该文件。你能简单地解释一下吗？你能简单地解释一下吗？解释什么？“处理此类文件的Content manager”或任何链接或文档