In This Video I showed you how to connect your Samsung phone to PC successfully.
By dialing *#0808# and select MTP + ABD
Subscribe to my channel https://goo.gl/Qp13Qn
Also if there are any old driver when you connect your device and the phone is not connected. Uninstall it and choose the option to delete files.
This should help..
This will work on
Samsung s10 s10+ s9 s8 s7 note 9 note 10 not connecting to PC fix and Samsung tab A and other Samsung devices.