Err, Umm
I am a rather large fool at the best of times and I am a bit dumb on these damned receivers. Some of the genius guys in this forum will no doubt correct me if I am wrong!!
Here is your rear panel:
View attachment 112998
I think you are correct to take the L/R zone 2 output and put the SM decode to the input multichannel zone 1.
Re those 2 recordings, do you know what format they were recorded in? Your best default mode if its not SQ is the "INVOLVE " mode for all else.
If you have a "switched " smart outlet, plug the SM into it and leave the SM on/ off button in the inwards ON position and all should automatically turn on.