Course 5, week1, assignment 3

I can not apply any changes to my assignment
it can not be saved
it can not be downloaded
it can not be submitted

I’ve tried everything, I’ve restarted kernel, server but still, nothing happens
I need help

I just visited the page, downloaded the notebook, made some changes and saved them, and ran all the cells.

No problems.

I don’t know what to recommend to you.

It took about 15 seconds for the notebook to load.

thank u for your respond
I found the problem
apparently, any changes outside the graded functions might result in such kinds of problems