There are two formats of animation file used in Second Life™. Which one to use? Medhue gives us his take on the two formats.
https://www.youtube.com/watch?v=1ILjijdszYc
Basically, ANIM avoids the SL Import Program’s gotchas.
Medhue talks about animation priorities, for the overall animation and/or for each individual bone.
Bone translation has additional options in ANIM. If you aren’t familiar with the idea of bone translation, think bone placement.