First off hats off to you. I decided to give Flux.ai a shot after I stumbled across one of your tutorials on youtube. Polygon pours are a must have . Flux cannot explain it away as aribitray shapes. I do quite a bit o RF design and there are normally specific trace shapes required t meet impedances reduce parasitics etc and also for matching networks for anetenna's and RF tuning switches. Not to mention a lot of other applications like buck converters etc.

Its been 2 years I wonder why Flux has not been able to still implement it. Since I am quite new to flux at least I realise they now have copper fills but the custom shapes is also sorely needed. I have not figured out how to go around this. Maybe using Illustrator to create the shapes and importing as svgs but that will take too much time and effort for something that is quite easy in Altium or most other CAD packages