I'm pretty new to Affinity Photo, but I've used the Flood Select Tool a lot in the past. It's not working for me, however, on a certain image. If I create a new document and paint a little and then click in my paint with the Flood Select Tool it works, but if I paste an image in and try to use it in the "(image)" layer it doesn't work. If I then merge that image layer down to my pixel layer I'm again able to use the Flood Select Tool to select color areas of the image. Can someone explain what's going on here? Thanks.