@ZZ Thanks for posting your question in Microsoft Q&A.
Currently below are the list of supported deployment technologies to deploy your functions-to-functions app in elastic premium SKU.
Based on the shared information, I understand that you are trying to deploy the functions using the Cmdlet
func publish
which is using the zip deploy to deploy your functions and you are unable to edit them from the portal.
As called out in the documentation here, you can edit the functions which are created or last modified from the portal only.
Below are the languages which support portal editing JavaScript, PowerShell, Python, and C# Script functions
Hope this helps, let me know if you have any further questions on this.