How to transfer audio files from the phone to a (BLUENRG+STM32+SDcard), without using additional software on the phone? I'm not sure, but I need an FTP profile. I need to realize the transfer of a sound file using the built-in Android / IOS functions on the device and play this track at the touch of a button on the device. Like single-mode BLE devices do not support FTP. Tell me where I am wrong and advise a solution that can solve my problem. Thank.
PS Maybe I'm wrong that I need FTP.
