XLTraining

Hi, all. It's probably me being stupid, but I have a problem with removing backgrounds from photos. I select the Selection Brush, pick a suitable size, and "trace" around the outline, usually of a face. Fine, no problem. Then I select the Flood Fill tool, pick (say) white as the colour, and "tip" into the background. O.K., except that if I have used flash photography, or natural lighting has caused a shadow, this dark/black area does not get filled by the flood tool. Even though it is outside of the lassoo'd selection area. I then have to use the Paintbrush tool, set to white, to clear this dark area. Is this a problem with Affinity Photo coding, or am I missing something? I would appreciate any help/comments asap, as I now depend on this for photo-editing ID cards in my work. Thanks in advance, Pete

I've read through what seems like hundreds of FAQs & forum topics, but I'm now losing the will to live !!!!! All I want is the equivalent of the "Cutout Studio" in PhotoPlus (8). Can anyone tell me - 1 Is there an equivalent in Affinity Photo? 2 If so, how do I get to it? Many thanks for your expected help/advice. Regards, Pete