Nextcloud Server 10.0.1. Nextcloud Windows desktop app Version 2.2.4 (build 2).
Syncing is working as expected but there are no icons on any files or folders and there is no option to “Share with Nextcloud” from within file explorer when I right click a file or folder.
I have another laptop with the Owncloud desktop app Version 2.2.4 (build 6408) and it is working just fine.
The problem is that Nextcloud does not have own developers for the client yet. To identify the responsible part you could try, if the owncloud-client works (they should be identical except the branding). If the owncloud client works but not the nextcloud, they did some errors with the branding and the Nextcloud-Bugtracker would be the best place for it.
If it fails with the owncloud client, you can try to reproduce it with an owncloud setup (e.g. demo.owncloud.org) and report it to the owncloud bugtracker. If you have problems with the Nextcloud-branded client, they are not very happy to help you out…
This definitely appears to be a problem with the re-branding, more specifically the location of the program files.
The problem only exists when I uninstall the owncloud client (or move or rename the Owncloud directory) so it seems that Nextcloud may be using resources located in the Owncloud program files directory. If I re-install Owncloud but not start it and only start Nextcloud then the icons and the sharing option return.