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# NSFileProviderIncrementalContentFetching

Support for fetching changes to the item’s content.

```
protocol NSFileProviderIncrementalContentFetching : NSObjectProtocol
```

## Overview

Adopt this protocol to support the incremental fetching of changes from your remote storage. If you don’t implement the [`fetchContents(for:version:usingExistingContentsAt:existingVersion:request:completionHandler:)`](/documentation/FileProvider/NSFileProviderIncrementalContentFetching/fetchContents(for:version:usingExistingContentsAt:existingVersion:request:completionHandler:)) method, the system calls your [`fetchContents(for:version:request:completionHandler:)`](/documentation/FileProvider/NSFileProviderReplicatedExtension/fetchContents(for:version:request:completionHandler:)) method for all updates.

## Topics

### Incrementally Fetching Contents

[`fetchContents(for:version:usingExistingContentsAt:existingVersion:request:completionHandler:)`](/documentation/FileProvider/NSFileProviderIncrementalContentFetching/fetchContents(for:version:usingExistingContentsAt:existingVersion:request:completionHandler:))

Asks the file provider for an update of the specified item.


---

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