Playing midi files on Kawai Digital Organ

We are trying to figure out how to play midi files via the midi connectors on the Kawai LH-1. We have the cables and connectors but can't seem to get any sound on the organ from our connected devices. Do we need a special daw or application to play the midi files on the digital organ? If anyone has a step by step process it would be greatly appreciated.

Yes, you need to make some assignments to the sounds and speakers.

You can find the manual on-line, however, it tends to be a minefield of ads trying to trick you into downloading applications, so be very careful.

I am going through the manual and connected my midi interface but can't seem to get things to play. Do I need an app or DAW to play the midi files?

We have the same organ in our building. I have found the following configuration to work for us.
1. We plugged in a wireless MIDI receiver (CME WIDI Master Premium Bluetooth MIDI Adapter)
2. Then connected my phone to the Bluetooth connection.
3. I had to download an app on my phone, and found the 'NS MIDI Player' to be the best one for iPhones.
4. From there, we can assign the digital output to be the MIDI Adapter, which shows up on the output options (such as iPhone speaker, or headphones, etc.).
5. Then I created a playlist in the app with the MIDI files for the hymns, and press play.

We use this for our prelude music, and some of the hymns that aren't loaded into the organ natively (which for us is about 60% of the older hymnbook, and 100% of the new hymnbook).

*Caveat with the Bluetooth connection is that if you are out of range, or if it is interrupted, the organ stalls and just holds whatever note it played last (like someone holding down the keys infinitely). This can be stopped/reset by power cycling the organ.