Size preview image set

Hello, friend. Let me ask, I was confused about the size of a preview of a set of a4 brochure items. I was confused because I did not know the exact size to which envato would have to go, if there was a maximum measure? I’d like to ask your friends for advice.
Thank you

The max width allowed for an image in the Preview Image Set is 900px. There is no max height, but try to keep it as short as possible as to not need so much scrolling.

Thank you firend,
wish you good health always