Options for uploading files for attachments. When sending emails with the API that require attachments first upload each attachment. Then use the returned attachment ID in your SendEmailOptions when sending an email. This way you can use attachments multiple times once they have been uploaded.


Base64ContentsstringBase64 encoded string of file contents. Typically this means reading the bytes or string content of a file and then converting that to a base64 encoded string. For examples of how to do this see
ContentTypestringOptional contentType for file. For instance application/pdf[optional]
FilenamestringOptional filename to save upload with. Will be the name that is shown in email clients[optional]

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