Inaccurate description of the "post attachment" method in apidoc.

Hi, get some trouble with understanding of your "attachments" resource in api docs for api v2.
https://developer.atlassian.com/bitbucket/api/2/reference/resource/repositories/%7Busername%7D/%7Brepo_slug%7D/issues/%7Bissue_id%7D/attachments#post

You dont specify name of the parameter for uploading file, and i can't attach file to issue via REST API.
Always getting 400 error

Can you help me? Thanks in advance.