This property contains the size in bytes of the attachment.
def get_message_attachment_size(message_attachment_index: int) -> int: ... def set_message_attachment_size(message_attachment_index: int, value: int) -> None: ...
This field contains the size in bytes of the attachment.
The message_attachment_index parameter specifies the index of the item in the array. The size of the array is controlled by the message_attachment_count property.