Hi there keithrdavis,
If an app icon is not showing as expected in the Files app, the first thing we would recommend is to restart your iPad using these steps from Restart your iPad since this refreshes the software of your device:
1. Press and hold either volume button and the top button until the power off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the top button until you see the Apple logo.
Also ensure your iPad is fully updated. This installs feature enhancements and bug fixes that can resolve unexpected behavior like this. This shows how to back up and update: Update your iPhone or iPad
If this continues after restarting and updating, then the app developer would be the best equipped to look into this issue further. Use this to reach out: How to contact an app developer
Cheers!