Either:
A) From the Anim BP: Try Get Pawn Owner → Cast to MyCharacter → Get MyVectorVariable
or
B) From Character BP: Drag “Mesh” (Skeletal Mesh) component into blueprint graph → Get Anim Instance → Cast to MyAnimInstance → Set MyVectorVariable
Either:
A) From the Anim BP: Try Get Pawn Owner → Cast to MyCharacter → Get MyVectorVariable
or
B) From Character BP: Drag “Mesh” (Skeletal Mesh) component into blueprint graph → Get Anim Instance → Cast to MyAnimInstance → Set MyVectorVariable