My existing pdf files will only open as a single page pdf in LibreDraw. The first page is viewable and the remaining pages are not visible and not listed / available.
File a bug report at Bugzilla, and attach a sample PDF; specify OS and LO versions where you experience that.
I cannot confirn the claimed behaviour. With some of the pdf on my system I tried opening with LibO now and then. As expected the ‘Draw’ component was used, and for each page of the pdf a page in ‘Draw’ was created. Probably you only need to open the > ‘View’ > ‘Page Pane’.to see additional pages.
(BTW: LibO can only “open” a pdf converting it into a ‘Draw’ document where text paragraphs are contained in shapes.)