Solution: in the flask file from werkzeug import secure_filename, FileStorage reports error cannot import name'FileStorage'

If you can not appear to import secure_filename from werkzeug can be changed from werkzeug.utils
if complete change occurs can not import name 'FileStorage'
to write two lines:
from werkzeug.utils import secure_filename
from werkzeug.datastructures Import FileStorage

FileStorage is under werkzeug.datastructures