I tried for more than 10 times to create atmosphere in some of my pictures, using the instructions you gave in Vimeo - Affinity Photo - Creating Atmosphere.
I got stuck all the time at the same point, using the brush 6 as instructed, therefore the brush doesn't work as expected. The effect of the brush does not appear at any time.
I'm using Affinity 1.5.2 updated. I have Affinity installed in I Mac with OS Sierra updated.
Please, could you provide me some additional instructions how to proceed with this editing.
Thank you in advance.