Xperia Transfer 2: Can't transfer data from an Android device to Xperia using the app
IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details.
When using the Xperia Transfer 2 app to send data from an old Android device to a new Xperia, the data transfer may fail if the sending device's screen turns off. This happens when your Android device is idle to save energy.
To work around this issue, make sure your Android device displays the Xperia Transfer 2 app and that the screen remains turned on during the data transfer.
For more information, visit Xperia Transfer 2 app: How to transfer data/content from an old Android phone or iPhone to your new Xperia phone.