Hey! I wanted to hop in and offer some additional recommendations for you.
When you share your Item Bank (see image below), you have a couple of share option. If you click "Share with Institution" and you mark it as "Can View", no one at the institution will be able to make edits to your Item Bank. It forces them to use the bank as is. Additionally, you can share with individual users so they can either view or edit. You can learn more about that functionality in this guide.
Finally, New Quizzes will become exportable soon, so you will be able to do the functionality you described (export and send it to a colleague) shortly. You can follow the New Quizzes Roadmap in the New Quizzes Hub or connect with your CSM for more information.
