[Auto-resize Slices to canvas dimensions]

I would like to see this too. I switched to Affinity products as I couldn't warrant the subscription fees with the adobe products. often despite exporting as a .psd, a lot of my software Davinci Resolve for example will not recognise it as a .psd with layers and appears as a flattened image. The work around for me is export layers as a tiff etc, however it takes me hours sometimes to resize all layers to document size. I can't believe this isn't possible....