From vCenter export VMs or templates as OVA. Upload this OVA to Glance. VIO supports OVA format.
Qcow Images : convert these to VMDK using qemu utils. Upload the VMDK to Glance . VIO supports VMDK formats.
IF you uploads some images and they are of VMDK, OVA, ISO formats and are not working, then just paste the meta data info for the image. You can obtain that from Glance CLI commands. To run the CLI for Glance check this thread for how to run CLIs https://communities.vmware.com/thread/514423