如果计划在其中包含所有文件的目录，则可以使用 UPLOADED_FILES_DEST 变量.

If you plan to have one directory with all the files in it, you can use the UPLOADED_FILES_DEST variable.

UPLOADS_DEFAULT_DEST 用于处理上传集(我建议)，如下所示:

UPLOADS_DEFAULT_DEST is used to work with Upload Sets (which I recommend) like so:

app.config['UPLOADS_DEFAULT_DEST'] = TOP_LEVEL_DIR + os.path.join('ppaysees', 'app', 'static', 'img')
photos = UploadSet('photos', uploads.IMAGES)

# then you can simply call the Upload Set api:
photos.save(request.files['photo'])  # Save a photo
photos.load(id)  # Load a photo
url = photos.url(photo.filename)  # get photo url