Hi - am self hosting NextCloud. It works great from browser… including access from (anywhere on ) internet outside of my LAN. So I been using it - on laptop - by browser (both firefox and chrome)
I just installed the ios app onto my iPhone and getting 2 symptoms. First - it did let me access to my Nextcloud server - then it let me enter my user/pw and then…an infinite loop of waiting for it to “grant access to device” 
And then a second problem - after retrying a few times - and even logging on via the browser on my iphone (which does work happily ) – then the app crashed with a long error message … Two screenshots attached - a few identifying addresses tokens blotted.
