Seems since some Nextcloud-desktop versions app can't show add account option
in the menu.

Steps:
1. Start Nextcloud-desktop
2. Click on the app on system tray, main window appears.
3. Click on dropdown menu. Add accounts appears.
4. Add the first account. Complain all details and finish.
5. Go to steps 2, 3 and 4 again. Add accounts option does not appear

I try app from standard repo and flatpak package. Both fails.

Appimage from https://nextcloud.com/install/#install-clients works as expected.

Extra: Another packages even in another distros fails in the same way:

https://help.nextcloud.com/t/nextcloud-desktop-client-with-support-for-multiple-nextclouds-accounts/2239/4
https://help.nextcloud.com/t/desktop-clients-number-of-multiple-accounts/103614/4

Thanks.