Question Attack Animation Playing Incorrectly

I created animations for my character in Maya using a parent constraint to attach the sword to the player. Before exporting the model, I deleted the constraint and parented the group containing the sword to the point it was originally constrained to. By setting the model's animation type to generic, I was able to get the sword to constrain properly for the model's idle and walk animations. However, during the attack animation, the sword is not constrained to the hand like it is in Maya. Does anyone know how I can solve this issue?