If a bone has a “.L” suffix and you copy to the buffer and then paste mirrored. It will attempt to find the “.R” bone and flip the relevant channels and paste it to that bone.”
@tanya53@wayne on contrary to the what has been mentioned above, i have tried to do so but its not working for me.
but yes ,when i have copied Ik_feet_R and paste the mirror to the Ik_Feet_L by selecting Ik_Feet_L.it has give the result as per the tutorial.
PFA https://screenrec.com/share/gt9jMTbnWk for reference.
plz be patient while watch the same ,i was bit lost in between,its 2 min long though