Is the phone Charged or Discharged during File Transfer? (Charger Tester Android app)

Charger Tester (ampere meter) ► https://play.google.com/store/apps/details?id=com.apps.asterios.charger&hl=en&gl=US Positive mA value = Phone battery is being charged Negative mA value = Phone battery is being discharged mA = Milliampere (Unit of Electric current intensity, 300mA = 0.3Ampere)