A document (using lyx-2.3.3) has several letter-size (612 x 792 points) PDF images in appendices. the problem is that the appendix heading (a Chapter environment), e.g., "Appendix A: Maps" is spaced down from the top of the page so the letter-size PDF is cut off at the bottom.
Two possible solutions occur to me: 1) Insert a new page between the chapter heading page and the PDF image. 2) Insert \vspace{-2cm} in front of the appendix title. I'm leaning toward solution 1 because some of these appendices are log forms and intended to be copied as needed. Your thoughts appreciated, Rich