Hey men! since no one answer this one, I will tell you, first read this doc: https://docs.unrealengine.com/en-us/Platforms/Android/GettingStarted
and also this one : https://docs.unrealengine.com/en-us/Platforms/Mobile/Android/SettingAndroidDeviceDevelopment
With the last one you ensure that your devide , the one you are gonna use for test can be use from the ue4 editor.
Hope this help you , if not , just let me know by
twitter : @manoloon1 , and we try to found the answer on coop.