Initially,my app installed well in my samsung tab a.when it rolled up into a large app,my app can’t be installed (I thought so).I try to leave my thumb drive inserted through up the copying of APK file, through up the install process,until my app finally installed (seems like eternity).anyway I hope it helps,my content security policy is : “Content-Security-Policy” content="default-src ‘self’ ">
Best rdgs,tst