Trial Version only in Mono?

[silas]

Testing out the trial version of USB Audio Recorder with a stereo mic connected via OTG to an Android device, Samsung Galaxy Note 5. I'm seeing the option to record a stereo input under I/O, but am being allowed access to change it from mono to stereo. When touching "Mono 1" to change it, the drop down arrow simply disappears. Is this a limitation of the trial, or what else could be causing this?

Many thanks in advance.