The basic process of uploading latex files to arxiv has been clearly explained by other bigwigs, here is the main record of the problems I encountered and the solutions.

Background: I used the ACS achemso template in overleaf coding.

Need to pay attention to.

1. the reference format is bbl instead of bib, bbl is a compiled intermediate file that can be exported directly after overleaf compilation.

2. in the first five lines of .tex add \pdfoutput=1%For ARXIV

Problems encountered.

In overleaf compile completely fine file upload to arxiv after reporting an error: \pdfoutput=1%For ARXIV

Solution:

1. may be a coding problem, add \UseRawInputEncoding in the first line of .tex

2. arxiv file transfer when the original file is deleted and replaced by a new file, sometimes the update will not be timely, or the compiled results of the original file, you can go back to the original interface to refresh or simply re-login.