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# MLMediaSourceAppDefinedFoldersIdentifier

The media source for app-defined folders. This identifies a media source created from a relative path inside the caller’s app bundle. This source provides data when [`MLMediaLoadAppFoldersKey`](/documentation/MediaLibrary/MLMediaLoadAppFoldersKey) is provided in the options.

```
let MLMediaSourceAppDefinedFoldersIdentifier: String
```

---

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