Side Loaded apk keeps disappearing

Using Side Quest, and after performing a factory reset on my Oculus 2 headset, I was successful loading an apk from a developer.  I was able to locate and run the apk in an Experiential link I found on my headset. The application worked perfect.  Once I shut my headset off and restarted, the apk is no where to be found.  I've been dealing with this for months now - any help or suggestions would be appreciated.