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FFT Denoise - no FFT spectrum generated

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I am running Affinity Photo on Win 7 Pro 64 bit. A photo scan with prominent paper texture stipples - circular bumps - throughout in regular arrays, failed to generate an FFT spectrum after running FFT Denoise.

Procedure: I tried full photo, then later a smaller all white area. I selected FFT Denoise > Spectrum panel > Apply > FFT Denoise appeared to run > result: nothing, all black, no FFT spectrum generated.

What am I doing wrong?

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Thanks stokerg. However, I realized my mistake last night. I had got in a muddle over the layers, and the wrong layer had been selected before the run. When I corrected this I got a proper looking spectrum, and reducing my brush size to 45 for the dark mask spots, got a really excellent result. As the FFT Denoise feature was the prime reason I discovered Affinity Photo and subsequently downloaded a trial version, I was very happy! - and I will now buy it. I had looked at other ways of implementing FFT on my textured photo scans, but I got wary when I saw how much fiddling with Windows parameters via command lines was involved - too risky, I thought. I think that the tutorial on FFT Denoise could be beneficially expanded, for example, what kind of layer should be preselected.

I also think that this powerful feature should be given more prominence in Affinity Photo's promotional material, because I believe that neither PhotoShop nor PaintShop has it embedded or available as a convincing sounding plug-in.

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