When you connect your Android device to your Windows computer, you should be able to easily browse its contents using the Windows 'Explorer' window. However, if you connect your Android device to a Mac computer, things would be a bit more difficult. In this second case, in fact, you will need to use a specific application, such as 'Android File Transfer' for Mac. Using this application you will be able to browse the folders and files contained in your Android device using your Mac.
Steps
Step 1. Download the 'Android File Transfer' application
You can do this by accessing the following website: 'https://www.android.com/filetransfer/'. Once the download is complete, move the 'Android File Transfer' application icon to your Mac's 'Applications' folder.
Step 2. Connect the USB cable
Connect one end of the USB cable to your Android device, then plug the other end into a free USB port on your Mac.