Set multipart/form-data header while sending attachments > 3mb

[byteg]

Describe the bug
"Content-Type": "multipart/form-data" is not set when I try to send attachments > 3mb.

To Reproduce
Some steps involved to reproduce the bug and any code samples you can share.

request_body = {
  subject: "send large attachments",
  body: "large attachments",
  attachments: [
    {  content: "<large content here>", content_type: "", size: SIZE, filename: "filename"}
  ],
  to: [{email: "[email protected]"}]
}
response, _request_id = nylas.messages.send(identifier:, request_body:)

I get an error:
Nylas::NylasApiError (request must be of content-type multipart/form-data or application/json):
Expected behavior
Large attachments are sent correctly

SDK Version:
nylas (6.1.1)

Additional context
Update: IT DOES NOT HELP
Possible fix:
https://github.com/nylas/nylas-ruby/blob/main/lib/nylas/handler/http_client.rb#L101
Add line:
resulting_headers["Content-type"] = "multipart/form-data"

[mrashed-dev]

Hey @byteg! Thanks for opening this issue. Can I ask what the type of object is getting sent?

[maxmetcalf12]

I think the solution here is to send the attachment as a Nylas file object if it is >3mb. I have the following code that is working for me.

if attachment.blob.byte_size > 3.megabytes
  Nylas::FileUtils.attach_file_request_builder(file_path, name)
else
  {
    content: base64_content,
    content_type: attachment.content_type,
    filename: name,
  }
end

-- UPDATE --
Looking deeper into it, I think you can just use Nylas::FileUtils.attach_file_request_builder for all requests and it should handle them (as of 6.1.1). The one bug here is you lose filename if the attachment is >3MB, but that's probably a separate bug.