File thumbnails imported in Eagle sometimes display as application icons instead of actual content previews. This occurs due to issues with macOS QuickLook functionality, which fails to properly generate file preview images.

Detection and Repair Methods

First, you can confirm whether the file preview function is working properly through the following steps:

In Eagle, select the file with abnormal thumbnail display, right-click and choose "Open in Finder"
In the Finder window, select the file and press the "Space" key to check if the file content can be previewed normally

If you can only see the application icon instead of file content, please try the following repair methods:

Repair Methods

Method 1: Reset QuickLook Service

Open the system "Terminal" application
Enter the following command and press Enter to execute: qlmanage -r cache

Method 2: Reinstall Related Applications

Visit the official website of the related application to download and install the latest version. This can resolve issues with .qlgenerator files that are not properly installed or are outdated.

Method 3: Re-save Files

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

Refresh Thumbnails in Eagle

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

Fix issue where file thumbnails display as application icons (macOS)