Android version: 10
Device model: Oneplus Nord and Nokia 6.1 tested
Stock or customized system: Oxygenos and Android One tested
Nextcloud app version: 3.12.0
Nextcloud server version: Owncloud 10.0.10
I have already asked on reddit:
https://www.reddit.com/r/NextCloud/comments/i8y1uu/cant_login_from_nextcloudandroid_to_my_owncloud/
I got new phone (Oneplus Nord), installed Nextcloud-android app from f-droid (3.12.0) and tried to login to my self-hosted owncloud server (10.0.10). When I input server address in nextcloud app it takes me to server's webpage and not app.
On my old phone (Nokia 6.1, android 10) I am able to use app, because I logged in long time ago when using android 8 (before upgrade). My user works on Nokia 6.1+android 10, but if I try to add new user, the same happens (html)
The ownloud-app (from f-droid) works as expected, but nextcloud-app is better.
Here is the login screen

the "webpage" of owncloud server login inside nextcloud app

owncloud webpage in nextcloud android application

when set address to owncloud andorid app - the user and password fields appear

I think that recent releaes of the Nextcloud app are not compatible with ownCloud anymore. Why don't you upgrade to the latest Nextcloud version on the server?
I taught own/nextcloud is just branding and default addons thing.
I stopped updating my owncloud instance, since I always had to invest multiple hours to fix some issues. I imagine that converting owncloud to nextcloud would trigger even more issues and time to get it running again.
Is it possible to get old apk? (f droid only have last 3 versions)
No Nextcloud has a lot of new features that ownCloud has not and also vice versa 馃槃. I think the login flow is the one that's breaking your ownCloud login here. You should really update your ownCloud / Nextcloud version regularly to prevent security issues! You can find all the Nextcloud Android releases here https://github.com/nextcloud/android/releases.
Thanks for info!
WORKAROUND:
I was able to login using version 3.9
https://github.com/nextcloud/android/releases?after=rc-3.9.1-01
apk: https://github.com/nextcloud/android/releases/download/stable-3.9.0/nextcloud-30090090.apk
login using version 3.9
update new apk from github releases page
(it didn't work via f-droid for me this time)
I will try to update my owncloud and switch to nextcloud.
What to do with this issue? it should be mentioned somewhere. I was not able to find this info elsewhere
I think this won't become an official how to as it is a pretty hacky workaround. But you are totally right it should gain some visiblity for others to find it. Though my tip would be to pick a goog title + add some keywords / clear information to the main issue description. That way others will find it threw Google or GitHub itself 馃槂.
Owncloud is not supported.
this workaroud might work for login, but maybe will create trouble later.
Most helpful comment
Thanks for info!
WORKAROUND:
I was able to login using version 3.9
https://github.com/nextcloud/android/releases?after=rc-3.9.1-01
apk: https://github.com/nextcloud/android/releases/download/stable-3.9.0/nextcloud-30090090.apk
login using version 3.9
update new apk from github releases page
(it didn't work via f-droid for me this time)
I will try to update my owncloud and switch to nextcloud.
What to do with this issue? it should be mentioned somewhere. I was not able to find this info elsewhere