Laravel Storage put returns true by the files not completely uploaded

I'm using Laravel Storage with S3 to add files to a bucket. When running Storage::disk('s3')->put('myfile.zip', 'myfile.zip') in artisan it returns true. However, the file locally is 15mb but then on S3 it's 18b. No error in the php log. Don't know where to look next.

via Chebli Mohamed