how to send an image in a webSocket request using postman

I am new to socket.io and want to send images using postman in a WebSocket request. I have searched for it but could not found any reasonable answer. I have attached the SS of my postman request.

Following is the server-side listener code for the socket.io

$socket->on('send-message', function ($data) use ($io, $socket) {

                $validator = Validator::make($data, [
                    'token' => 'required',
                    'socket_id' => 'required',
                    'receiver_id' => 'required',
                    'message' => 'required',
                    'file' => 'required|file|image'
                ]);

                if ($validator->fails())
                    return $io->emit('error', json_encode(['message' => $validator->messages()]));
                    
                    return $io->emit('success', json_encode(['message' => 'image uploaded successfully']));



            });

from how to send an image in a webSocket request using postman