Annotation Issues with Large PDFs in Calibre-Web

Hello Hypothesis team,

I've been utilizing hypothes.is for annotations within Calibre-Web, an e-book library project. While it functions effectively for EPUB format, I'm encountering an issue with larger PDFs.

Here's how the annotation appears for EPUB:

However, for larger PDFs, the experience is different:

Upon selecting text in a PDF and attempting to use the hypothes.is Annotation button, it fails to display the expected text box for annotations, which is seen with EPUB. Interestingly, this problem is prominent with larger PDFs (e.g., several hundred pages). For smaller PDFs, roughly around ten pages, the annotation feature works as anticipated.

For reference, I've been using the Microsoft Edge browser with the hypothes.is plugin sourced from: https://chrome.google.com/webstore/detail/hypothesis-web-pdf-annota/bjfhmglciegochdpefhhlphglcehbmek.

Would appreciate any assistance or insights on this matter. I'm eager to understand whether this is a known issue or if there's a potential solution at hand.

Thank you for your time.