Storage putFile 504 error

I am uploading a large file to S3 and getting a 504 Gateway Timeout error returned to me. That confusing part is the file does indeed still upload, but on the frontend after a bit I get the 504 error? I am streaming the file so I thought this would prevent burning resources?

Here is the full code:

 public function store(Request $request)
    {

        $request->validate([
            'email' => 'required|email',
            'video' => 'required',
        ]);


        if ($request->hasFile('video')) {

            //Upload original file
            $original_key = Storage::putFile(
                'originals',
                new File($request->file('video')),
                ['Content-Disposition' => 'attachment']
            );

            //Convert file for preview
            $config = [
                'PresetId' => '1351620000001-100070',
                'width'  => 1920,
                'height' => 1080,
                'aspect' => '16:9',
                'ext'     => 'mp4',
                'PipelineId' => env('PIPELINE_ID'),
            ];

            $elastcoder = new ElastcoderAWS();

            $original_array = explode('/', $original_key);
            $preview_key = end($original_array);

            $thumbPattern = "thumbnails/{$preview_key}-{count}";

            $job = $elastcoder->transcodeVideo($original_key, $preview_key, $config,  $thumbPattern);


            $submission = new Submission();

            $submission->email = $request->input('email');
            $submission->original = config('filesystems.disks.s3.url') . $original_key;
            $submission->preview = config('filesystems.disks.s3.url') . $preview_key;
            $submission->thumbnail = config('filesystems.disks.s3.url') . "thumbnails/{$preview_key}-00001.png";
            $submission->transcoding_id = $job["Id"];


            $submission->save();

            return response()->json([
                'submission' => $submission,
                'message' => 'Video Upload. Good Luck!!!'
            ]);
        } else {

            return response()->json([
                'submission' => false,
                'message' => 'Upload Error. Please try again later.'
            ]);
        }
    }