My BU113 flashes red when it is connected to the android phone, but everything goes fine on the PC. How can I solve it?

You need to confirm whether the type c port bandwidth of your android phone is above USB3 (5Gbps)

We recommend you connect BU113 to the PC by using the type C to A cable which comes along the package of BU113.
If you connect BU113 to the mobile phone, the type C to C cable transmission speed must be up to 5~10Gbps, otherwise, the bandwidth will be insufficient then you will see the red light appear on BU113.

In addition, your mobile phone also need to support USB3.1 Type C or above (Notes: transmission speed 5~10Gbps) 
Supported mobile phones such as: SamsungSung note 8:
https://www.gsmarena.com/samsung_galaxy_note8-8505.php
USB USB Type-C 3.1

Summary:
1. type c to c cable:
Please make sure to use a type c to c cable with 5~10Gbps/sec(USB 3.1) to provide enough USB bandwidth for BU113.
2. Please make sure that the phone is connected to the USB Type-C 3.1 interface.




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