Even if I connect my phone to USB, Windows Explorer doesn't show up

pu1. When you connect your smartphone to USB, a window appears asking if the smartphone will allow the connection, and you have to press Allow to connect to Windows Explorer.

2017-11-16

OK

pu2. It varies slightly depending on the smartphone, but there are cases like 1Pu, or there are cases where you need to unlock the smartphone to connect.

2017-11-16

OK

pu3. In some cases, the connection pops up automatically on each smartphone, or when you pull the top bar, an alarm pops up to connect it to a window where you can choose how to connect.

2017-11-16

OK

pu4. Maybe it's because of the smartphone lock

2017-11-16

OK