Why isn't my pdf shown?

I have my canvas printed as “func.png” with the code:
I just installed command “eog”, and I seccessfully print a png with command:
eog func.png
however when I changed the class of the file as:
the pop window of the canvas was shown but the canvas was blank:

and it says the pdf cannot load. What is wrong with that?

Did you try xdg-open file.pdf

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