이메일로 새 카테고리 주제를 만들 때 첨부 파일을 받을 수 있나요?

Yes it is, as well as uploading through the U.I. not just e-mail. There are default limits set in the admin settings that can be adjusted. Those only work up to a certain amount, to increase them past a certain level must be done through command line script.

Here is topic where found that out by:

Guide: