Can you please provide some code to help diagnose if this issue is internal?
One thing to consider is if you are referencing local files, you will need to run things locally by running a local server (such as using python -m http.server and accessing files from localhost:8000).
Another potential issue could be using the incorrect versions of three.js or three.min.js. You can find the correct versions in the github build folder and place them in the same repository as your HTML file for proper importing (
<script type="text/javascript" src="three.min.js"></script>
).
Lastly, monitoring your console in browsers like Firefox can provide insight into any errors that may be occurring and help troubleshoot the issue.