Unable to open attachments within PDFs with a browser.

This may be due to security settings within the browser/environment. One thing you may try is to set acrobat reader as the default PDF handler for MS Edge/Chrome as it may be a security specification set by the browser for handling the reading of the PDF with embedded attachments.

If using Edge you could do the following:

To set Adobe Acrobat Reader as the default PDF reader for Microsoft Edge, you can follow these steps:

1. Open Settings in Microsoft Edge:

   • Open Microsoft Edge on your computer.

   • Click on the three dots (...) in the top-right corner of the browser window to open the menu.

   • Select "Settings" from the menu.

2. Go to Default Apps:

   • In the Settings menu, scroll down and click on "Advanced" to expand the advanced settings options.

   • Click on "Default browser" under the Advanced settings section.

3. Set Default PDF Reader:

   • Scroll down to the "PDF documents" section.

   • Toggle the switch to turn on "Always open PDF files externally."

   • This setting will make Edge open PDF files in the default PDF reader installed on your computer, which in your case is Adobe Acrobat Reader.

4. Adjust Adobe Acrobat Reader Settings (Optional):

   • If you want to customize how Adobe Acrobat Reader behaves when opening PDF files, you can open Adobe Acrobat Reader.

   • In Adobe Acrobat Reader, go to Edit > Preferences (Windows) or Adobe Acrobat Reader > Preferences (Mac).

   • Here, you can adjust various settings such as default zoom level, toolbar options, and more.

By following these steps, you should be able to set Adobe Acrobat Reader as the default PDF reader for Microsoft Edge, allowing PDF files to open in Acrobat Reader instead of within the Edge browser.