Improve resolution on PDF images using Attachments macro.

Current Issue:

• Image previews have a lower resolution than the actual file
• Clicking the attachment to view it in the new file viewer renders the attachment in its proper resolution

How to Reproduce:

• Add a high resolution attachment (PDF or image) to a page using the new file insertion feature (Edit page > Insert files and images)
• Save and review the page

Expected Result:

• The preview image retains the same resolution as the actual file

Actual Result

• The preview image is of a lower resolution and can appear blurry (see screenshot)