/etc/php/7.3/fpm/php.ini
In some instances this line:
; Defaults to the system default (see sys_get_temp_dir)
sys_temp_dir = /var/www/nextcloud/data/tmp
Edit to point to your ncdata
commenting out the line works too.
as
; Defaults to the system default (see sys_get_temp_dir)
;sys_temp_dir = “/tmp”
seems to be default