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Why this option is not available in the Xperia Z3+? (Settings > Xperia Connectivity > USB Connectivity > Wireless Media Transfer is missing!)
I don't quite understand the post, are you looking to transfer media wireless under the USB connectivity menu?
Settings > Xperia connectivity > throw settings or screen mirroring, or cast screen or Media server settings
Look at this picture. Z2 is on the left, Z3+ is on the right. Also, I am unable to pair Z3+ to PC companion via Wi-Fi.
On the Z2 was an option that allows you to pair your phone over WiFi with a computer running PC Companion to transfer data (music, videos, photos). This setting isn't available on the Z3+ anymore. And yes, it was below the USB settings menu.