What are size restrictions for export?

4500 x 5400 @ 300 dpi

Unfortunately, this is a technical restriction. Based on the available memory of your computer, there are some limitations that don’t allow you to export images above a certain size at 300 dpi.

Other than that, we suppose you don’t need the design with these dimensions at all, only 1080 x 1296 at 300 dpi, which would result in an image with 4500 x 5400 pixels.