Are there some limitations to exporting for Photoshop? I have exported a pretty simple document from Affinity Designer (3 layers, 2 are raster, 1 is vector with only 3 objects, no fx except stroke) but when opening in Photoshop CS6 is fails with "Could not complete your request because an unexpected end-of-file was encountered."
The file was imported from a PSD but I used AD to modify/add to the shapes as it much easier in AD tahn Photoshop.
I'm starting to wonder if the exporter has some issues. I was playing around with SVGKit - https://github.com/SVGKit/SVGKit and SVG files exported from AD didnt work but when the file was opened and saved in iDraw it did work.