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I've check the layer and everything, the draiwng able to see. But when the pdf plotted, the drawing missing.
after a quick test,
I can not confirm, I am able to print the layouts and the viewports are plotted.
maybe there is something wrong with your PDF-printer settings.
have you tried to PUBLISH your layouts to PDF?
I've noticed that checking the "Plot Transparencies" checkbox helps with multiple image and .pdf related plotting issues.
it is visible everywhere but when I plot into pdf it went missing