cordova - Android not requesting permission in ionic app -

i building app allows people post pictures , videos, trying learn ionic, cordova, android, , like, reason whenever try open file using cordova file plugin, doesn't ask user permission access storage, , code fails , user stuck on loading screen. code pretty simple, take video, gets transcoded, transcoded file uploaded firebase storage bucket. if quit app, go settings->apps->my app->permissions , manually turn on storage permission, works. problem is, need ask user permission either @ run time or on install, , doesn't. here code..

this.media.capturevideo().then(file => {   this.editor.transcodevideo({     fileuri: file[0].fullpath,     outputfiletype: this.editor.outputfiletype.mpeg4,     outputfilename: 'temp_test',     savetolibrary: false,     height: 800,     width: 800,     maintainaspectratio: false   }).then(fileuri => {     let pathindex = fileuri.lastindexof('/'),         finalpath = 'file://' + fileuri.substr(0, pathindex),          name = fileuri.substr(pathindex + 1, fileuri.length);     this.file.readasarraybuffer(finalpath, name).then(file => {         //upload     }).catch(err => { console.log(err); });   }); }); 

however, works if open settings on phone, go apps, app, permissions, enable storage manually. there way request permission in ionic? have searched , searched , answers can find specific camera, or work in java, ionic isn't java. thank you.