flask_uploads: ImportError: cannot import name 'secure_filename'

In flask_uploads.py

Change

from werkzeug import secure_filename,FileStorage

to

from werkzeug.utils import secure_filename
from werkzeug.datastructures import  FileStorage

You are using a broken version of Flask-Uploads.

Unfortunately, the maintainer of the package decided not to release a new version of the package to PyPi.

You can use Flask-Reuploaded as a drop-in replacement, which fixes your problem.

https://pypi.org/project/Flask-Reuploaded/

According to this issue, it is a bug related to the current version 1.0.0 of workzeug. It's merged but not yet published in pypi. The workaround know until now is to downgrade from werkzeug=1.0.0 to werkzeug==0.16.0

So for do that you just need run the command:

pip install -U Werkzeug==0.16.0

Looking in the release notes from werkzeug there is a version 0.16.1, but in bug report there is no evidence that using that version could be of any help.