How can one add support for new Attachment mime types?

[aoncorici]

How can one add support for Attachment mime types like model/obj and model/mtl, see https://www.iana.org/assignments/media-types/media-types.xhtml#model

[fjwong]

@aoncorici We do not put any restrictions on the mime types of files you can select in attachment type questions, except for iOS which imposes certain restrictions in that regard. Could you describe a bit more about the issue you are experiencing?