Is it fine to submit a paper to a journal via arXiv without updating on arXiv? I have uploaded a preprint of my article to arXiv and it is published there. After that, I made several changes to it and I am submitting the same to a journal which allows submitting via arXiv (Physical Review E, to be specific). My question is, is it okay to submit the article without updating it on arXiv because I am submitting via arXiv?
If I understand correctly, the answer is "no" and seems to be obviously so.

The journal needs the latest version of your manuscript.  The journal will acquire your manuscript from arXiv.  Therefore, you must put the latest version of your manuscript on arXiv.

In any case, there seems to be no reason not to update the version on arXiv.