If you have earlier installed Android File Transfer Application on your Macbook, then you may view a warning message on your Macbook screen that says your Android phone not connected to the device. There can be numerous reasons as to why this is happening, and we will try to figure them out. Here you can learn how to transfer an Android file into your Macbook. Here are some steps to help you to transfer your Android data into your Macbook device.First Method: Enable USB Cable instead of USB Debugging
Use different USB cable, when you are facing the same issue.
Now attach your Android mobile phone into Macbook through USB data cable.
On your Android mobile screen, open Settings.
Switch on your USB option and select MTP (Media device) option.
Second Method: Diagnose MacbookYou have to assured to use Macbook OS X and Android version 3.0
Reboot your Macbook computer.
Open the Android Data Transfer application on your Macbook.
Third Method: Update your Android Mobile Phone
You have to upgrade your Android Mobile by completing the orderly Update.
Reboot your Android mobile phone and check that it is approved by your Macbook.
Use Android Mobile Assistant
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