How to restrict file size with aws-sdk getSignedUrl

Hello, I’m using digital ocean to allow users to upload videos using signed urls. However i wanna make sure the the file is the file size it request to upload, and current after hours of searching for an answer i cannot find one.

So my question is, how can i prevent users to steal the signed url and upload a massive file?

PS: I’m using ‘@aws-sdk/s3-request-presigner’ with the function getSignedUrl() as the example from DO says

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