I don’t believe Instagram has the ability for us to send PDFS through DM’s yet (someone correct me if I’m wrong). Perhaps you can take a screenshot of each page and send it as pictures?
You can save the watermarked pdf created using the ‘generate pdf’ feature, only when using a laptop/desktop. You won’t need to type the pattern again. It is automatically synced across devices.
I have to screenshot the pages when generating my patterns. My phone allows me to do long screenshots so small patterns can be on one page and longer ones I can have each section to a page. It would be nice to be able to save the generated pdf, maybe that will be added in future updates.
I know if you have a computer, you can use Control P to bring up the print screen for the PDF, and then rather than choose a printer, you can select “Print to PDF”. I don’t know if a phone would have a similar function.