thanks for the intervention. However, my priority at the moment is the functioning of the iOS APP as per the title of the post. Actually sorry, the problem is also on the Android APP. However, it seems that there is something on the server that is preventing the APP from working properly.
I reinstalled Nextcloud with APACHE server. Now the iOS (and ANDROID) APP work perfectly. On the Nextcloud forum I was told that Lighttpd is not supported. So I have to conclude that the problem lies in the web server.
Now I also want to experiment with Nginx (supported) to see if it is less heavy than Apache.
Have a nice day everyone
Officially it is not supported, but I run also my Nextcloud instance on Lighttpd without problems 
also on my instance when I was on dietpi 32bit. Not now ! the problem is that since it is not supported by nextcloud they were unable to give me instructions. If someone had given me further information, we probably would have been able to identify the problem. But this did not happen. Lighttpd is much lighter. I would have preferred to keep it too…
However, I repeat, the nextcloud instance WORKS VERY WELL. It’s the iOS and Android APPs that don’t work
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