Diskimage import not working

SYSTEM INFORMATION
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