Polymorphic upload field

[immotus]

For some unexplainable reason, the Upload field does not support polymorphism. The documentation says:

relationTo * - Provide a single collection slug to allow this field to accept a relation to.

This is surprising because its relationship counterpart happily accepts string[] and allows browsing for entries from multiple collections.

What makes it even weirder is that even the standard Lexical Upload block supports polymorphism with a handy drawer selector:

@jmikrut @jacobsfletch @PatrikKozak is there any explanation for this?

And how can one achieve Lexical Upload block behaviour with an upload field:

{
	type: "upload",
	name: "image",
	// SOMETHING LIKE THIS?
	relationTo: [ "assets", "media", "uploads" ],
	filterOptions: {
		mimeType: { contains: "image" },
	},
}

[jmikrut]

I believe this has been on our roadmap to support and it was just not prioritized.

@paulpopus is the eng that recently built out our upload field extensions - Paul, can we pick back up on this? I agree that it's strange that it's unsupported when it well could be.

[paulpopus]

Yep, can do this

[immotus]

Thank you, James and Paul!