How To Transfer Files Using USB Cable? (SOLVED)

Using /e/OS User Queries
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FYI, to have Android File Transfer work via an USB connection between a Samsung S7 Edge /e/OS 0.7-2019110830013 and a MacOS Catalina computer, i need to have ADB enabled and USB connection set to MTP.

Detailed procedure:

  1. On the computer: Install Android File Transfer
  2. Plug the smartphone to the computer with a USB cable
  3. On the computer: Android File Transfer will try to connect automatically but will fail
  4. On the smartphone: Go on Parameters => down to About phone => Down to Build Number on which you need to tap 7 times to display the Developers options menu => Go back in Parameters => Enter Developers options menu => Enable USB Debugging (Android Debug Bridge) and set Select USB Configuration to MTP (Media Transfer Protocol)
  5. On the computer: Android File Transfer may crash, or there will be old window(s) (related to step 3) saying that it failed to connect => Just click on OK or restart Android File Transfer => Android File Transfer then successfully display the data content of the phone.
  6. When finished with Android File Transfer, you may want to disable ADB on the smartphone: Parameters => Developer Options => Disable the main switch at the top, it will disable Developer options menu and automatically disable ADB.