iOS App

I’m running Volumio on my pi with a hifiberry card feeding an external DAC and have been reasonably pleased. (I’d love to see the level of integration between Tidal and my local library that Roon manages but that’s another story.) The challenge lies with the iOS app. The desktop browser app (on any device, including my iPad) finds Volumio instantly, while the iOS app now takes several minutes to find the Volumio device EVERY TIME IT’S LAUNCHED. Extremely aggravating since I paid for the app. Please advise. TIA