NANO clones, or older Arduino NANO’s, there has been a recent change. The upload baud rate has been bumped up from 57600 to 115200, and that causes a upload error.
The solution is at hand! Go to Tools > Processor > Atmega328P (Old Bootloader) and your upload woes should be solved!
avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xf6