After importing Sketch files into Eagle, thumbnails may sometimes display as Sketch application icons instead of the actual file content. This issue is typically related to the system's QuickLook functionality.

Troubleshooting and Solutions

First, you can verify whether the QuickLook feature is working properly for files on your computer by following these steps:

Select the problematic file in Eagle, right-click and choose "Open in Finder".
In the Finder window, locate the file, select it and press the "Space" key on your keyboard to confirm whether you can see the file content preview instead of just the application icon.

If you can only see the application icon, please try the following solutions:

Method 1: Reset QuickLook Service

Open the "Terminal" application on your system
Enter the following command and press Enter to execute, which will reset QuickLook plugins or refresh the cache: qlmanage -r cache

Method 2: Reinstall Sketch Application

Download and install the latest version from the official Sketch website. This can effectively resolve issues where .qlgenerator files are not properly installed, as well as eliminate compatibility problems caused by outdated versions.

Method 3: Re-save Sketch Files

Open the file using the Sketch application installed on your current computer, then re-save or export it to update the file's thumbnail information.

Refresh Thumbnails in Eagle

After completing the above troubleshooting steps, return to Eagle, select the problematic file, right-click and choose "More - Refresh Thumbnail" to have the software regenerate the thumbnail.

Important Notes

QuickLook functionality is crucial for Eagle to generate correct file previews
If the problem persists, please ensure that both your macOS system and Sketch application are updated to the latest versions
Some older Sketch file versions may have limited compatibility with newer systems

How to Fix Sketch File Thumbnails Showing as App Icons (macOS)