Another fix I believe..

Symptom: When the cell phone is connected to computer/laptop, and the small thumbnail icons of the  pictures will not show in Windows Explorer on the computer, and "transfer files" and/or PTP option is chosen in the "connected devices" option on the phone.

fix: I think downloading and installing the drivers from this web site fixed it. (well, I have a Moto G6, so your specific drivers will probably be from a different source. You just have do an internet search for it.)

download and install: Motorola_Mobile_Drivers_64bit 
https://androidfilehost.com/?fid=24269982087010424

restart computer
restart phone
...
..
.

I also tried the below, but it didn't work:

Developer Options:

1) USB debbuging - ON

2) Revoke access to USB debugging - tap OK ***************** worked for someone...

3) Scroll down and select Select USB configuration - MTP

4) Connect to a different USB port on your computer

You may need to enable the USB Debugging in the Developer Options  for you to see the USB configuration selection. To enable the Developer Options (Settings > System > About Phone > Tap "Build Number" 7 times consecutively). Once done, you'll see a prompt message. Go back to Settings > System > Developer Options > Enable USB Debugging. Once enabled, try connecting your phone again. Let me know how it goes.