Is it permitted to upload HTML template in one envato account and WordPress version of the same template in another account? Is there any restriction? Or how we manage permission? Will envato contact to our html template account for the permission or do we need to submit any ownership documents?
Yes it is possible to HTML one account and WP another account but need a permission from the original item author with ticket.
Here you will find about Envato Author Collaboration
It’s fine as long as the second version has permission to make the conversion
If it’s both you then you can explain this in notes to the reviewer.
If it’s a separate author then the original author needs to open a ticket with envato giving permission and share the ticket ID in the notes to reviewer for the second item