Wow I did not know they have the LaTeX for all the papers and compile it themselves! That's pretty crazy. What if they don't have packages you need? What if your paper isn't written with LaTeX?
They specify what version of texlive they use. This is significantly better than what publishers offer (usually a really old latex version, not even pdflatex).
Unlikely. But if so, you can provide the packages yourself: https://info.arxiv.org/help/submit_tex.html#wegotem
> What if your paper isn't written with LaTeX?
Then they still accept PDF or HTML. See: https://info.arxiv.org/help/submit/index.html#formats-for-te...