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Tried \DeclareLanguageMapping{english}{english-apa} again in a v1 project and it worked as well.

That is really cool.

Thank you so much for your help.
Everybody who has got the same problem:
Write

\usepackage[backend=biber,style=apa]{biblatex}
\addbibresource{example.bib}
\usepackage[autostyle ...

I tried this \DeclareLanguageMapping{english}{english-apa} already some days ago but it did not work either.

So, I think the problem was that I run the template in v1 because when I open a MastersDoctoralThesis template in v2 backend=biber and style=apa works without problems!!

I changed what you have commented but I still have problems running biber in that template because I think in overleaf everything is done automatically so that I don't have to do something further besides changing from backend=bibtex to backend=biber. Do you think that this is related to the ...

Hello,

I am trying to do my bibliography in APA style in the MastersDoctoralThesis Template of Overleaf.
Unfortunately, only this code works:
\usepackage[backend=bibtex,style=authoryear]{biblatex}
\addbibresource{example.bib, Mendeley.bib}

and when I try this code it does not work:
\usepackage ...