WHIMWILD

Troubleshooting Guide

If you cannot see thumbnails or previews for STEP files after installing Step Preview, please try the following steps.

1 Reset QuickLook Cache

Sometimes the macOS cache prevents newly installed previewers from taking effect specifically for thumbnails. Open Terminal, copy and run the following command:

qlmanage -r && qlmanage -r cache && killall Finder

Note: This step is specifically for resolving issues where 3D thumbnails are not appearing correctly in Finder. After running it, check the folders that previously failed to show thumbnails.

2 Check System UTI Recognition

If resetting the cache doesn't work, there might be a conflict in how the system identifies STEP file types (UTI). Run this in Terminal:

mdls -name kMDItemContentType [Drag your STEP file here]
How to: Type mdls -name kMDItemContentType (with a space at the end), then drag any .step or .stp file from Finder into the Terminal window and press Enter.

Check the returned value and send the result to our email: