This adapter works very well with Dragonfly from Audioquest (Sound amplifier-DAC)

Even the manufacturer of the Dragonfly Red DAC, suggest you purchase this version of the Apple Lightning adapter, for portable AMP/DAC use with your iPhone.

This unit also permits you to charge your iPhone (and even your excellent FiiO external DAC), while playing music.

I love my iPad Pro but this product price reflects Apple's pripensity to price gouge instead of simply providing inputs of various sorts, as well as, the lack of a micro SD card for a storage alternative

Works as it should if you connect an ac adapter to it it will charge while you use what ever device you are connecting

It has limitations as to what types of files you are able to transfer - but the limitations for this device are the ones caused by what Apple has imposed in their iOS software.