I'm following up on my comment from last month - I was editing an email in CC tonight, using the same workaround as described above, when suddenly in the middle of editing I no longer have the option to link my image to a PDF (which is still the only way I've figured out how to eliminate the blurry/pixelated issue with PDFs in emails!)  I hope CC resolves this ongoing issue. ... View more

I've been having the same issue with uploading PDFs (which were properly formatted/sized for emailing) - they looked pixelated and blurry. The workaround that I found was to upload a PNG of the same file (sized to 1200 pixels wide), and then linking to the PDF document. It works, and the emails look better, but it definitely adds an extra step of creating and uploading two separate files. ... View more