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Hey all, I'm struggling to create and export an Alpha Channel from Affinity Photo (v1.7.1.404) to a CMYK .TIFF image. The image has been masked out and I'm trying to make a named Alpha Channel to be used as a Spot Colour for digital print in an Onyx RIP (To be names 'Spot 1' which refers to a Spot White Ink). Please see the attached screenshot for the masked out area which I'm talking about. I've followed several other posts and YouTube/Vimeo video's and it's just not clicking for me. The image will export as a .TIFF but it won't export an Alpha Channel no matter what I try. Methods I have tried: 1. Mask out areas, on the 'Selection raster Alpha' channel, right click, and 'Create Spare Channel' and name it 'Spot 1' 2. In the layers under Adjustments, create and Channel Mixer and pull up the Alpha slider. What am I doing wrong? Thanks for your help!

I've been using Affinity nearly daily since designer was still in beta, and there is only one crucial thing I'm missing. We print using an industrial UV printer that utilizes spot white ink, and in the past (with adobe photoshop) I needed to create a new channel called 'spot white' and export the document as a PDF document. Then the rip software would recognize this 'spot white' channel and know to print white where indicated. As of now, I'm still exporting from designer or photo and then adding the white with photoshop. It's a very tedious process that loses me several hours a week. I've tried many times to achieve the same results from affinity designer and affinity photo with spot colors or attempting to add a new channel. Am I missing something, or is this simply a feature that affinity software isn't capable of at the moment?