Transfering Expansions

Hi there! I created a expansion using the MPC Expansion Builder, but I can't figure out how to put it on my mpc because it is .xpn file. If I put it in my Expansions folder on my sd card and put it into my MPC, it doesn't show up as an expansion. Please help! Thank you!

Drag the xpn into the mpc software grid to install it in the mpc software. Then go to file > export > expansion to transfer to your standalone disk