Thanks for the data!
Issue is the CV power supply, which is not dimmable:
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Even a Shelly RGBW2, which is working at the secondary (low voltage) side of the power supply doesn’t help: Obviously, the strip consumes too much power and would overload the RGBW2. Sorry…
Addendum: Assuming you‘re using this strip:
Cubalux Led Strip 14.4kWh/1000h/m 12V dc
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we need to know how long the strip is. If it is a 5 meter strip, power consumption would be about 75W (one channel), which doesn’t correspond with the max. power of 45 W per channel of an Shelly RGBW2 with 12V supply.