Use the quaternion interpolation mode menu to select how to import the quaternion interpolations contained in your file into the host application. Select from the following three options:
Resample as Euler interpolation
This is the default conversion setting for quaternion interpolations.
This option converts and resamples quaternion interpolations into Euler curves to ensure interoperability.
Retain quaternion interpolation
This option retains quaternion interpolation types during the import process.
This option lets you change the interpolation type of quaternion keys to a Euler type, without resampling the animation curves themselves.