Hi! I had the same problem while trying to package to Oculus quest.
Found this instructionthat helped me:
Type in command prompt:
C:\Users\adamos>adb shell hero2lte:/ $ cd sdcard hero2lte:/sdcard $ ls Alarms DCIM GSWave Music Pictures Podcasts Samsung Android Download Movies Notifications Playlists Ringtones UE4Game hero2lte:/sdcard $ rm -r UE4Game/
Edit: FYI. That “ls” is (LS) with small letters. Thanks for the clarification!