fringe axle
I know that PDFs can be added as attachments and that can be viewed inside the app (at the right). I just think that it would be nice that they could also be embeded if people prefer.
Of course, not high priority or anything, just a suggestion for a "nice to have" feature.
fleet heart
I would also love a feature where we could see some icons for different types of files. E.g., zip files have zip icons and pdfs have their own icons. Maybe a small scrollable preview (as you said. An embed). I think it can come in handy while dealing with different files types in a single note.