Hi,
Where: CoronaBitmap
When: If you try to animate Offset (U or V) and/or Rotate degrees (They are apparently kind of connected / wired)
What:
No matter what type of controller or what in/out type you assign to the animation keys the result will be a bezier curve that eases between the keys.
In the trackview / graph things will look eg. linear between keys, but its not linear, its always bezier interpolated keys.
Copying the same keys to a regular 3dsmax Bitmap produce the expected result.
3DSMax 2021, Corona Renderer 6.