I managed to install on a raspberry 3 Volumio this morning, and I can, with my computer (ethernet router connection) access the Web-UI interface Main page and use Volumio.
My problem is my phone, connecting via Wifi to the router cannot connect to Volumio. Whether with chrome, and the ip address. Or with the application, which does not find the device, or even by manually adding the ip address.
Can you help me ? thank you very much