I’m wondering if the reviewers are outright rejecting our submission just based on the preview.jpeg we send, without even looking at the entire product. Because if you look at the review process, sometimes there’s no indication that they tested the code, and the review results come back so quickly.
I’d appreciate your thoughts on this, everyone.
If it’s not appealing or have good features from the quick look, I don’t think they are checking the details ( coding etc. ) If you pass the first stage, then they will probably checking the code quality, etc.
My opinion-
Thank you for your answer. One more thing, regarding the high resolution option for the CodeCanyon PHP script category, what should I select? As far as I know, this resolution is more related to images and similar aspects.
Also, if you don’t mind, could you leave a comment on my post about the product I’m planning to submit? 
Please advise before I upload my item
I know you’re busy, but your feedback would be very helpful in minimizing the chances of rejection. 
Just upload it. It’s not gonna make any difference what anyone thinks about the item. If the reviewer doesn’t like it, it goes to the same end.
You’re right, and this is what makes me, as an author, confused. It feels like gambling when trying to publish an item for sale. Will it be accepted or rejected? And when it’s rejected, I have no idea why it was rejected, so I don’t know what to do next
For an Item to be approved on Codecanyon
