Existing Text Annotations Not Importing/Visible in Scanned Linked PDF

Hi Zotero Team,

I am facing an issue importing existing annotations into the Zotero PDF Reader and need assistance troubleshooting.

My Setup:

OS: Windows 10/11

Zotero Version: 7

File Storage: I am using the "Linked Attachment Base Directory" feature. The file is not stored in Zotero; it is a linked attachment pointing to a local directory.

The Document:

The file is a technical manual (scanned PDF, image-based, potentially no text layer). I have sent an email to support@zotero.org with a link to this thread and a copy of the file.

The file contains existing text comments/sticky notes created in Adobe Acrobat.

I can see these comments when opening the file in Adobe/external viewers.

The Problem: Within Zotero library, it doesn't see these annotations. When I initially used "Add link to file" it also only added the hyperlink and did not create a parent item.

I have done the following

Manually created a Parent Item (Report type).

Nested the linked PDF under the parent item.

Question: Is there a limitation on importing annotations from scanned/image-only PDFs for Linked Files?
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