Redmi Note had some issue in getting detected in PC (while connecting via USB).
This app helped:
MIUI USB Settings
First ensure, USB debugging is enabled.
You need to go to additional settings -> Developer options -> USB debugging.
Then Open this app and enable MTP.
Now, Android storage should be available in PC.
For getting Developer options, you need to click on MIUI version few times. (It will display how many times to click to get Developer options enabled).