victor0_ASUSNo its not an expected result, phones like Max pro m1 doesn't misbehave like 5z while on OTG for Pendrive.
Hi, this is an expected result. When using OTG, if not powered by an external USB port, it draws the energy from your phone, and USB sticks/hard drives are not usually designed to work with low power, and they do take a toll.
Also, I know it's not ideal, but the fewer files you have on the drive you're using the better. With more files, your device spends more time and energy scanning them.