Ask HN: Should I implement my own integrity checks on my fileserver?

So I have an SFTP server [Ubuntu 24.04.2 LTS (GNU/Linux 6.8.0-55-generic x86_64)] and an SFTP client (Windows 11): the client downloads files from the SFTP server. I had an idea to implement integrity checks by hashing the file on server side and also hashing the client's copy of the file after it is downloaded, then comparing the hashes to ensure the data was downloaded correctly. My question is: should I spend time implementing this? Does the OS already do this? This seems like something an OS should do.