decode method
Implementation
@override
Future<AttachmentContent> decode(EncodedContent encodedContent) async {
return AttachmentContent(
data: Uint8List.fromList(encodedContent.content),
mimeType: encodedContent.parameters['mimeType'] ?? 'application/octet-stream',
filename: encodedContent.parameters['filename'] ?? 'attachment',
description: encodedContent.parameters['description'],
);
}