I haven’t encountered this particular issue, but I use Particle Photon as my main platform and I know that not all of the latest functionality is available on Particle. The one I encountered was CRGBArray.
Hmm, interesting. I’m not sure what the difference is between the two FastLED libraries in Particle. The 3.1.8 version lists “RickDB” in addition to Daniel & Mark. But it doesn’t show a number after the cloud icon, which I take to mean fewer people have added it to their projects? In any case, I searched for setMaxPower (which @Bill_Goodrich was looking for) and didn’t see it in the source code. I also didn’t find CRGBSet which is one of the features I’m missing, for Particle.
Honestly, I’m probably running into the same problem and don’t know it. I’m a newbie and have only successfully gotten a few sketches to work. I’m learning, though!