RGB Triple Output not fading

I’ve picked up one of the 5mm triple output RGB leds ( anode ) from seeedstudio and am having issues with fading.

The colors will change but only in full colors ( red, green or blue ) with an on/off state - no fading, no white or yellow, etc.
I’ve tested the individual pins used on a single white led and the coding for the fades are fine. It will brighten to full and slowly darken to off.

Any suggestions on what the issues might be?

Is it not possible to fade anode leds?

My bad.

I wasn’t using a PWM output pin.