The Nextcloud Desktop Client is a tool to synchronise files from
the Nextcloud Server with your computer.
Nextcloud client enables you to connect to your private
Nextcloud Server. With it you can create directories in your home
directory, and keep the contents of those directories synced with
the server. Simply copy a file into the directory and the desktop
synchronisation client does the rest.
There is no official package available for openSUSE Leap 15.5