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# add(_:position:)

Adds an existing payload arc to the prim.

```
func add(_ payload: USDPrim.Payload, position: USDPrim.ListPosition = .backOfPrependList) throws
```

## Parameters

`payload`

The payload to add.

`position`

Where to insert the payload in the prim’s payload list.

## Discussion> Throws: An error if the payload cannot be added.

---

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