Abdussamad:

All the tile says is that it is Electrum 2.6.4


HCP:

I recall setting up the co-sig as the Mac Wallet with MPK, I either sent a test amount to myself from Linux to Mac, or it was to an exchange (I can't remember) but upon opening the Mac Wallet (which leads me to believe that first test was to myself and I went into the wallet on the Mac to see), I was immediately asked to sign the transaction, it just popped up to do.

That initial test did not require the save transaction process, and loading in the other wallet.