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3D files don't display thumbnails on Wikipedia (and other wikis except Commons)
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Description

3D files from Commons don't display thumbnails on Wikipedia (and other wikis except Commons).

For example, I just uploaded this file to Commons: https://commons.wikimedia.org/wiki/File:Prince_Rupert%27s_cube.stl. On that page, it displays with a thumbnail and 3D viewer.

image.png (980×1 px, 141 KB)

However, the Wikipedia page for this file has no thumbnail and no 3D viewer: https://en.wikipedia.org/wiki/File:Prince_Rupert%27s_cube.stl.

image.png (980×1 px, 181 KB)

The file also doesn't display as a thumbnail when used in an article: https://en.wikipedia.org/w/index.php?title=Prince_Rupert%27s_cube&diff=826147954&oldid=826125560&diffonly=0. Only a link to the file page appears:

image.png (980×1 px, 301 KB)

Looks like the 3D extension is only enabled on Commons – it should probably be enabled on all wikis (but with uploads of .stl files disabled). That will probably be enough to make this work?