[erlang-questions] some help with hackney and multipart

[Caragea Silviu]

Hello,

I'm trying to send an email via mailgun.com using the hackney and I have
some issues sending attachments (which requires multipart).

https://documentation.mailgun.com/api-sending.html#sending

Basically my interest fields are:

    from
    to
    subject
    text
    attachment File attachment. You can post multiple attachment values.
Important: You must use multipart/form-data encoding when sending
attachments.

I tried the following:

PayloadBase =[
    {<<"from">>, From},
    {<<"to">>, To},
    {<<"subject">>, Subject},
    {<<"text">>, TextBody},
    {<<"html">>, HtmlBody}
],

Payload = case Attachment of
    null ->
        {form, PayloadBase};
    _->
        {multipart, PayloadBase ++ [{file, Attachment}]}
end,

But for some reason the attachment is not sent.. Everything else works as
expected.
I don't see how I can set the filed name to "attachment" as required by
mailgun .. at this this is what I suspect beeing wrong

Silviu
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