# QLPreviewRequestCopyContentUTI(_:) Returns the UTI for the preview request. ``` func QLPreviewRequestCopyContentUTI(_ preview: QLPreviewRequest!) -> Unmanaged! ``` ## Parameters `preview` The preview request object. ## Return Value The UTI of the associated preview request; returns `NULL` if the UTI is not available. You should explicitly release this object when it is no longer needed. ## Discussion Thread-safety: This function should be called in the same thread as the preview request is made in; generally, this is the same thread in which the `GeneratePreviewForURL` callback was invoked. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)