On the edit page of an instance, the "Add Item" button under network interfaces is in the disabled state. Since the button is visible, I guess this operation should be allowed in some way. Is it correct? How can I add a new interface to an existing instance?
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There is no way to add additional network interfaces after the instance has been created. This can only be done during instance creation, please take a look at the requirements for assigning multiple network interfaces

Patrick W
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