With Cloudamo you have access to cPanel > Terminal to execute occ commands and to do updates etc. over terminal.
Go to cPanel > Terminal > type cd public_html/updater/ and hit ENTER
After above command, type: php updater.phar, hit ENTER and fallow steps on screen.
That is all, you can update Nextcloud quickly now at anytime.
In case it report extra files, like error_log or some folder, you need to delete these files or move them. You do this over cPanel > File Manager > public_html