Gai,
Today it works as I would expect. The pdf file comes in clear, with a surprise. The background is transparent instead of white. That's nice. So what was happening before? π I am going to edit my previous post.
Still does not come in at the correct size, but has to be re-sized (Hey Google team! β ).
And if I update the pdf file (save in same name from my CAD file) LO will do the update at the size I have made it in LO. This is just one step from updating direct from my CAD. π
Thanks for the idea, Gai! Although changing the paper size did not affect the insert size.
For window users including OP, you can do the same with .png, just save at a high enough resolution. Your background might not be transparent so put it on a bottom layer. It will also update.
Peter