i'm using Texmaker on Mac. Every thing was fine till I copied the pdf file and pasted on desktop then changed its name. When I compiled my work, it showed me "file not found", I deleted the pdf I created on my desktop, but the pdf was in template disappeared

I used different Tex editer to see if i can get the pdf file which disappear every time I compile my work!
I really need help to fix that on Mac!
Thank you,