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POST

Body

string
required
Base64-encoded file content. Decode the file to bytes, then encode to Base64 before sending.
string
required
Original filename of the attachment (e.g. "invoice.pdf"). This is the name shown to the email recipient.
string
required
MIME type of the file (e.g. "application/pdf", "image/png", "text/csv").Accepts either mime_type or mimeType.

Response

object

Storage limits

Attachments count against your organization’s storage quota. When the quota is exceeded, the API returns a 413 error with details on current usage and your plan limit. Upgrade your plan from the billing dashboard to increase your storage limit.
Last modified on March 19, 2026