Sending funds to a Mission to cover expenses

What is the preferred method to send funds to a mission to cover medical expense from a pre-existing condition, that the local unit has agreed to cover? Check or Funds Transfer?

I'm not sure as anyone visiting the forum would know unless they had personal experience with your situation. I would review the situation first with my stake clerk. If he doesn't know, a phone call to the missionary department would be my next step.

I don't think you can do a Funds Transfer in MLS outside your stake.