---
title: MLMediaSourceAppDefinedFoldersIdentifier
framework: medialibrary
role: symbol
role_heading: Global Variable
path: medialibrary/mlmediasourceappdefinedfoldersidentifier
---

# 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 is provided in the options.

## Declaration

```swift
let MLMediaSourceAppDefinedFoldersIdentifier: String
```

## See Also

### Constants

- [Aperture Media Group Type Identifiers](medialibrary/aperture-media-group-type-identifiers.md)
- [Final Cut Pro Media Group Type Identifiers](medialibrary/final-cut-pro-media-group-type-identifiers.md)
- [Folders Media Group Type Identifiers](medialibrary/folders-media-group-type-identifiers.md)
- [GarageBand Media Group Type Identifiers](medialibrary/garageband-media-group-type-identifiers.md)
- [Logic Media Group Type Identifiers](medialibrary/logic-media-group-type-identifiers.md)
- [MLMediaLoadAppFoldersKey](medialibrary/mlmedialoadappfolderskey.md)
- [MLMediaLoadAppleLoops](medialibrary/mlmedialoadappleloops.md)
- [MLMediaLoadExcludeSourcesKey](medialibrary/mlmedialoadexcludesourceskey.md)
- [MLMediaLoadFoldersKey](medialibrary/mlmedialoadfolderskey.md)
- [MLMediaLoadIncludeSourcesKey](medialibrary/mlmedialoadincludesourceskey.md)
- [MLMediaLoadMoviesFolder](medialibrary/mlmedialoadmoviesfolder.md)
- [MLMediaLoadSourceTypesKey](medialibrary/mlmedialoadsourcetypeskey.md)
- [MLMediaSourceApertureIdentifier](medialibrary/mlmediasourceapertureidentifier.md)
- [MLMediaSourceCustomFoldersIdentifier](medialibrary/mlmediasourcecustomfoldersidentifier.md)
- [MLMediaSourceFinalCutIdentifier](medialibrary/mlmediasourcefinalcutidentifier.md)