I am trying to add the file type .webm to the MODX cms. I have therefore added the .webm to my .htaccess file and via the content type option in MODX (3.0.2-pl)
Added this to my .htaccess file. 
AddType video/webm .webm
AddType video/webm .webmhd.webm
AddType video/webm .webmsd.webm
And added this to my content types.
Still, I can not upload the .webm extension files. 
You’ll need to add that to the upload_files system setting.
The content types in MODX are about the types your resources can be, not what files are allowed.
@markh Thanks for the tip, it’s also in the Uploadable File Types, Uploadable Image Types (webp) and the Uploadable Media Types.
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