Hope this is a legal question. I want to add a cleaning app to my Nvidia Shield. I’m not able to sideload it because the USB stick it is on won’t fit in the 2nd USB slot along side my 128 GB Sandisk.

I downloaded APK Time and it loaded to my external drive. If I remove the external drive USB to make room for the cleaning app, APK Time won’t run. I also moved APK Time from my external to internal but I still lose APK when I remove the external. Apparently I need to have both running on my Shield, but as I said, they both do not fit. How else can I do this?