Preserving Layers when exporting from Express to Photoshop

Is there a way to keep the layers designed in Express to export to Photoshop while preserving the layers in one file?  I know the only option is to use the pdf. download option and open in Photoshop as pdf. pages, but the only way I know how to work with the layers from Express using photoshop is to copy (or drag) them back into the main PDF file within photoshop.