How does a client / customer use the edit/measure tools and such and then download a copy of their work?
Hi @scenephoto360,
Welcome to Pix4D Community!
It is possible for your client to edit and export the annotation layer if you previously shared the project with a link that allows edit and save permissions.
For creating and editing the annotations, the following articles explain how to do this:
For exporting, just access the Annotation under the Layer menu and click on the Export icon.
For more information, please refer to the following article: How to export/import annotations on PIX4Dcloud
I hope this information was useful for you.
Have a very nice day.
Best regards