Attachment Macro not supported while trying to convert a page from legacy editor to fabric editor.

Issue Summary

Attachment Macro not supported while trying to convert a page from legacy editor to fabric editor.
User has to manually remove the attachment macro before conversion and then add it again to the page after converting the page to the Fabric editor.

Steps to Reproduce

• Create a page in the legacy editor and add attachment macro on the page.
• When converting the page to Fabric editor you will see the below error:
  
• Once Attachment Macro is removed, you will be able to convert the page without any error

Expected Results

The page should be converted to the fabric editor without any error when attachment macro is added on the page

Actual Results

Receive the below error when trying to convert the page to Fabric editor with Attachment macro added

Workaround

Remove attachment macro on the Legacy editor page and then add it again after conversion to Fabric editor