You can upload ISO and OVF / OVA to catalogs to use with virtual machine creation.
This operation requires the rights included in the predefined Catalog Author or an equivalent set of rights.
If uploading an OVA fails we highly recommend converting into an OVF as shown here.
Note: Uploading an OVA/OVF may take a long time depending on upload speeds. During the upload the progress will sit at 1%. Once the progress moves past 1% the upload is complete and the system is importing the OVA/OVF from the staging directory into the Catalog.