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It would be great if arXiv upload screen said this. Not sure if it does or not.

• sibrahim 10y ago
  That's certainly been my experience. I've had arXiv automatically block bare uploads of TeX-derived PDFs (presumably identified through PDF metadata). For these, it required that the source be uploaded and compiled on their server. On balance, it's probably best to require source as arXiv does, but this can create interesting issues from time to time. Since the source is downloadable, researchers can inadvertently end up sharing partial results or snark that was commented out in the TeX source.
• kkylin 10y ago
  I haven't uploaded a paper in a while (coauthors have been doing it more recently), but I'm pretty sure it encourages uploading document sources somewhere during the process. The issue that sibrahim mentions, about stuff in comments, is real: on a multi-author tex the file tends to end up being pretty messy, with lots of informal remarks and old versions in the comments. I always strip out all the comments before submitting.