Type Alias SendMessageMedia

SendMessageMedia:
    | string
    | { path: string }
    | { contentType: string; data: Uint8Array; filename?: string }

One media attachment on an outbound message:

string — a publicly reachable http(s) URL; Dial downloads and re-hosts it.
{ path } — a local file, uploaded as multipart; MIME type inferred from the extension.
{ data, contentType } — raw bytes, uploaded as multipart; the MIME type is required.