-Why when I open same PDF in Photoshop in opens as blank page (all the graphic info disappears)??? -And why when I'm trying to measure a page in the "image size" (in order to send to client, for example) the graphic info disappears as well??

-Why when I open same PDF in Photoshop in opens as blank page (all the graphic info disappears)???

-And why when I'm trying to measure a page in the "image size" (in order to send to client, for example) the graphic info disappears as well??