This is working great on live, after update to cbox 1.3.0. Thank you!

Hi Syelle and Ryan,

Besides adding the latex and ltx file extensions to the uploaded file types, you also need to register the mime type for the file type with WordPress.

You can do this with the following snippet in /wp-content/mu-plugins/:

/**
* Add custom items to mime type array for uploads
*/
function my_mime_types( $types )…[Read more]