Correct, but the text blocks aren't free-floating, so unless the email has been built with the same proportions and line-up as the email builder, importing the images as backgrounds and then using regular text blocks wouldn't really look the best.
You're welcome to of course try, but without seeing your PDF myself, I can't really provide much further insight.
Ultimately, it sounds like it'd be more efficient to build the email within the editor directly, or to simply link to the full PDF from the regular email.
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