Good morning, I purchased the new annotation plugin and am trying to integrate it into my application. I have a few questions.

1- Is it possible to detect when a new annotation has been added? I need this because I would like to allow saving only when annotations have been added.
2- How can I save the PDF file with annotations? I don't need to download it locally, otherwise I would use your download function. I save PDF files in s3 and have the reference in the PostgreSQL database. Your download function works well and I would like to reproduce the same behaviour.

Regards