Fabric PDF Macro does not see attachments on a page

Issue Summary

Fabric PDF Macro does not see attachments on page

Environment

Fabric Editor

Steps to Reproduce

1. Create a Fabric Page
2. Attach a PDF to the page, either with drag-and-drop or using the Files & Images menu item. 
3. Try adding a PDF Macro /pdf

Expected Results

PDF Macro sees attachments on page.

Actual Results

No attachments show up in the dropdown list. At times this is temporary and takes a few seconds to load, but in the eve

Workaround

Keep PDF attached to page using step #2 above, with Files & Images menu item. PDF can be previewed when this macro is clicked: 

Notes

In many cases, it only takes a few seconds before the list of PDF attachments display.