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Download source code from Overleaf if you use it:
menu->download->source. -
Strip comments and combine all
texfiles (f01-main.tex,f02-intro.tex, etc.) into one filearxiv_main.tex.
# Replace f01-main.tex with the main tex file in your overleaf project
latexpand --empty-comments f01-main.tex > arxiv_main.tex