As it stands, a PDF cannot be embedded into an email. However, you can easily link to a PDF from an email.
Navigate to Settings > click Assets.
In the Assets navigation bar > click Saved PDFs.
Click Upload a PDF > Select the PDF you want to upload from your computer.
Once the PDF is uploaded, Xplor Growth will populate a unique URL for this PDF asset. Easily copy/paste this URL link into your email, and recipients will click the link and be quickly taken to your PDF!