proxmox gui don't show files on storage

hi there,

i can't see any files on my storrage systems. no backup, no iso, nothing... :(

i can upload a iso with gui. but again, gui don't display this iso on this storage-system.
the iso is uploaded to /var/lib/vz/template/iso and i can see this file on cli:

root@hyper-2:/# ls -l /var/lib/vz/template/iso/
total 47536
-rw------- 1 root root 48621568 Nov 18 11:46 umzug.iso

in gui, i work as 'root@pam', so it should be no access-problem.
i can see all virtual server. i can stop and start these server. but i can't see any backup-file of these server on the backup-storage with the gui.

i found no errors in the logs. PVE-Version is 3.0.23

any hints?