Adding message with custom metadata to conversation
I am using the POST `/conversations/cnv_123/messages` endpoint to add a reply message to a conversation that already exists. When I fetch the messages, I see that they contain a `metadata` field that is just {}. Is there a way to set custom metadata fields for later use in the endpoint? When I try just adding a `metadata` field to my payload, the operation passes but the metadata does not persist when re-fetched.
