Attaching PDF in Extra Card Details

When I make my flashcards, I often use notes made by school as the notes that I put int he extra card details. I usually have to copy and paste even when I have the PDF in Remnote. This takes up a lot of time.

It would be nice if I could just attach these PDFs (or just a part of it) to each flashcard so I have the option to re-read it while I’m reviewing instead of having it open separately then looking for the part that I need to review.