I have asked before and found myself an intermediate solution using pdf.js in web view. It works fine to display in original size.
But using gesture to enlarge only works with the viewer, but I feel the quality is really bad on mobile (stuttering, tiles, artefacts).
It seems there are file opener plugins, which I assume will prompt for application. But I want no app selection, just a fast native viewer with close and print functionality. No sharing.
AI suggests to use either the browser plugin or write a native viewer plugin. Can a CapacitorJS plugin initiate a change from the main web view to a native view and back?
Would that be possible with UIDocumentInteractionController? A native view would always be fullscreen? Can I restrict buttons to close and print?