Diskimage import not working

OS type and version CentOS Linux 7.9.2009
Webmin version 1.994
Cloudmin version 9.6 Pro
Theme version 19.93.1
Package updates All installed packages are up to date

i try to iport a disk image, this diskimage is a exportet image from cloudmin.
Cloudmin Stettings > import system image > An existing disk image file on one of your systems > import system image
the link : /server-manager/manual_image_form.cgi?xnavigation=1

the problem is the image is not listet in the image directory after import
when i download a image from http://cloudmin.virtualmin.com/images/kvm-64-ubuntu18.04-base.ext3.gz this is working