Importing multi-channel audio not creating single soundwave

Following this process for “Importing Multi-Channel Audio” (How To Import Audio | Unreal Engine Documentation), it doesn’t create a single SoundWave file, instead making separate files.

My files are using the appropriate suffix naming convention as shown in the documentation screenshot. I’ve tested in 4.26 and 4.27.

350983-audionaming.png

Is this due to the new Audio Engine, or is there a setting I need to turn on prior to import?