Can't save the notebook in practice

Hi there:)

I’ve got some problems while practicing.
So I’d like to ask for your help to solve the problems.

The problems are as follows.
P1. I’ve got an error message when I try to save the notebooks for practice as below.

P2. I can’t download the notebook file from the server after I modify something. I can see only the blank page.

Thank you for the excellent lectures.

In some of the Short Courses, you are not allowed to download the notebooks.

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Thanks for your help!