I'm using downloaded LaTeX template in Overleaf and I want to have numbered bibliography. I try this one: \usepackage[backend=biber,citestyle=ieeetr,style=alphabetic,natbib=true]{biblatex}
but it still doesn't show numbers just [abrv of first author's name+year].
I've also tried many other combinations of this code but than it shows errors...
I've studied all code but I can't find place where I should change something to work

Please help me
