iPadOS Thumbnail Provider Extension not supported with Mac Catalyst

Originator:me
Number:rdar://FB7719898 Date Originated:May 31, 2020
Status:Open Resolved:
Product:Mac Catalyst Product Version:
Classification: Reproducible:
 
I'm working on creating a Mac Catalyst version of an iPadOS app I'm building now. Using QLThumbnailProvider, I was able to get thumbnail generation for the custom file formats my app supports working with no issue in the Files app on iOS and iPadOS.

However, when I go to embed my Thumbnails extension in my Mac Catalyst build target, I get the build error: 'Thumbnails.appex' is a Thumbnail extension, which is not available when building for Mac Catalyst. You may need to restrict the platforms for which this app extension should be embedded in the target editor.

Please consider allowing iOS thumbnail extensions to work with Mac Catalyst applications in a future software release.

Thanks for your time!

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