How to import Chinese font SimSun on overleaf?

Question

I am trying to use Chinese font simsun on the overleaf. but it gave me an error.

Firstly, I tried this solution, but it is not working.

\setCJKfamilyfont{zhsong}[AutoFakeBold = {4.27}]{SimSun}
\renewcommand*{\songti}{\CJKfamily{zhsong}}

I also use KaiTi font which is working fine.

\setCJKfamilyfont{zhkai}[AutoFakeBold = {4.27}]{KaiTi}
\renewcommand*{\kaishu}{\CJKfamily{zhkai}}

Then I found out a list of the CJK Chinese fonts which are available on overleaf from https://www.overleaf.com/learn/latex/Questions/Which_OTF_or_TTF_fonts_are_supported_via_fontspec%3F#Chinese

Then I upload SimSun.ttf in Overleaf and import from the uploaded font.

\setCJKmainfont{zhsong}[AutoFakeBold = {4.27}]{SimSun.ttf}
\renewcommand*{\songti}{\CJKfamily{zhsong}}

But I got these errors:

Package fontspec Error: The font "zhsong" cannot be found.

‪./thesis.cls, 160‬
For immediate help type H <return>.
...                                              
                                                 
l.160 ...JKmainfont{zhsong}[AutoFakeBold = {4.27}]
                                                 {SimSun.ttf}

A font might not be found for many reasons.
Check the spelling, where the font is installed, etc. etc.