I encountered the same actually as @Laci_Lacko but because I was trying also alternatives to Volumio, when I tried your guide for the second time I noticed that despite cd ... being there it won’t “jump back up” one folder so then www4 is in www3 and www3 is in www (at least that’s on the missing UI option for “Contemporary”).
Unfortunately I see some hiccups on the control via Chrome as well but it works in Volumio app.