Re: Trying to install PDF.js
Thank you Wiebe. Last year I'd been trying to do this with Tiki 18.3 and it would only download the pdf, not enable in-browser viewing. I only returned to Tiki when I found the document about pdf-js viewer for v19, and followed instructions thereon. Hence the complex process which I noted, including manual packages install. Turns out it's unnecessary.
So I just tried an in-line file placement as you suggested and see there is now an option for opening in browser. Excellent! I should've tried that first. I appreciate you taking the time to respond.
Dave