Enable new file extension

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Hello everyone,
I am currently working on a WebXR library and would like to allow the upload of different 3D mesh data in the editor.

I have to add the desired file extension to the PHP constant $defaultContentWhitelist, but the return of the function getWhitelist() does not change.
And so the new file type is still not accepted in the editor.

Do I have to make changes somewhere else?

I am using for development Drupal 7 in combination with the development folder.

Many thanks
gwulf

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