I have tried using "rclone copy" and "rclone sync" still I am facing same issue. I have tried using / at end of folder and even while removing / at end. still getting same error.
Yeah a 512 mb ram. But I can do individual uploads for even big files like 10gb plus. Is that error stands for memory? I am trying to upload 3gb of season folder.
You could try to limit the number of transfers by using --transfers 1 and you can use --nmap to reduce memory usage and --buffer-size 0M to turn that off as well and you can turn --checkers 1.
With only 512MB, you are probably fighting with other programs and by default it does 4 transfers and 8 checkers so that uses a bit of memory too.