Hi.

I am trying to use an animated texture sequence of 96 frames to drive the Opacity of a Prinicpled shader.
Texture Opacity works but only displays the first frame. So, $F does nothing.

I then found other discussions around this issue, and tried the Edit Properties method. This worked to advance the frames.
This is overly difficult and cumbersome to say the least.

Next step was to use padzero expression to loop the sequence of 96 frames. This also worked for a couple of frames but instantly filled the memory and I had to hard boot to get out of it.

How can it be this difficult to use and loop an animated sequence to drive parameters on a shader?

What am I doing wrong?

Did you remember to enable "Allow Shader Parameter Animation" in your material library LOP? The exported material in your usd files won't have any time samples otherwise.

Yes that was on, and it worked on the sequence.
Problem was when I included the expression to loop the 96 frames. Everything stopped working.

Only the first frame showed up.

Hrmm. Can you please file a bug with a reproducible case?