Where did Channels go (RBG+Alpha)?

There used to be a Channels selection in ME that had things like (RGB, RGB+Alpha, etc.).  I can't find it (v24.5).  I've tried to use AVI, Quicktime, and a few others, but no option appears for the channels.  I do see a check box for 'alpha only', but that is not what I want.

I've recently discovered I can choose a preset that states 'plus alpha'. I ended up using Quicktime and a profile with alpha. Oddly, I couldn't find it for AVI, and that is what I've used in the past.

Note that even when I choose the profile with alpha, I still don't see a specific setting that is tied to this. I'm still curious if I am missing something obvious, as removing the Channels option seems odd.