I also can't preview PDFs. Isn't PDF a core part of the graphics system (it is on macOS)?! I can preview .docx and HTML, but not a PDF?! They're getting better

I also can't preview PDFs. Isn't PDF a core part of the graphics system (it is on macOS)?! I can preview .docx and HTML, but not a PDF?! They're getting better at "back-porting" stuff from real computing platforms, like Files (which can even connect to SMB shares, though last time I checked only using protocol version 2 and with the least helpful of error messages when it fails ... why?!?!?!?!). But there's still a long, long way to go if they ever really want iOS to succeed macOS. At the current state of affairs the only way to make the iPad a full computing platform is using macOS sandboxes (which I had expected to come with the M-processors).