Avid Trim To Fill with Multiple Frame Rates

[Reena Mang]

I am in a 23.98 UHD project with shot footage and archival footage in multiple frame rates – 48, 24, 29.97, 30, 25, etc. I use trim-to-fill often, but I’m seeing that when I promote a clip, trim-to-fill will work on some frame rates (29.97 & 25) but not on others.
Does anyone know why this is & if there is an easy settings change to get trim-to-fill to work on the other frame rates?
Thank you,