I have tried :

<footer style='height:30px'>
      <span>Σελίδα {pageNum}/{numPages}</span>
</footer>
</body>
</html>

in order to get the page number on my PDF but it is not working. I just get :

/////////////////////////////////////////////// Copy - Paste from PDF report ////////////////////////////////////
Καθαρή Αξία(€) : 166,12
Σύνολο ΦΠΑ(€) : 39,38
Γενικό Σύνολο(€) :205,50
12DE4FF3E7DDB936977F40F47DB0594C532AC90C 0448 00023333 1811042052 FGB18007822 -
999244180;061632963;FGB18007822;0000000000;201811042052;0448;0023333;0085;221;A;15;0.00;4.42;161.69;0.00;0.00;0.00;0.58;38.81;0.0
0;205.50;0;DDBEB8E556A9D8666717AEE2413B47921F6EFF77

Σελίδα {pageNum}/{numPages}
///////////////////////////////////////// Copy - Paste from PDF report end ///////////////////////////////////

Any suggestions?

Is there a way to have page numbers on PDF exported reports?

I found the problem. The footer must be given in a div: