An unexpected import error happened. In case your browser lost internet connection while the upload was being processed, your geometry might appear after a refresh of the page. If the error persists, contact our support for assistance. (Error Code: 06f39a6b)
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Good point from Kai!
Please check out this post for more information: CAD Preparation & Upload | Simulation Setup | SimScale - if you give us more details, it is definitely easier to troubleshoot issues.