@BlynkAndroidDev Actually, I just tested with an UNO, zeRGBa and sliders on direct digital pins as well…
1st observation, I didn’t know you could share digital pins with the App as well… I thought it was just Virtual pins. AND they synchronize between the zeRGBa and slider widgets!! Nice!
2nd observation, The OP is correct, the zeRGBa only registers a signal at the extreme end of the range: 0 OR 255 (or perhaps just registering on the MAX range?.. I was using a common Anode RGB LED so I needed to invert my range settings). Sliders work as expected.
I also tried it without the sliders, in case there was some conflict… same issue.