I eventually did get it going, not a simple affair. But it's terrible the mobile touchscreen based UI does not work very well at all.
I'm amazed no one has some how got hold of the APK from the firetv sticks and put it online.
Mine will play them to start with but at least half the time I'll get it pause after some adverts and I have to go out and start again for it to carry on playing.Agreed, doesn't work very well.
I've just been trying the All 4 casting from android - absolutely zero issues with casting multiple things - made me realise I don't need a shield dedicated app at all
even the native app running on roku ss+ shows this, like the itv app too, sometimes you pause and comeback and have to step through adverts, back to where you left off,Mine will play them to start with but at least half the time I'll get it pause after some adverts and I have to go out and start again for it to carry on playing