AWS SDK v2 for multipart uploads fail

[coderSamuelLYS]

When using the AWS SDK v2 for multipart uploads, if the size of the current part file does not match the contentLength set in the code, the relevant method will block here until a timeout occurs. Does contentLength need to strictly match the size of the incoming file?
java

s3Client.uploadPart(request,
        RequestBody.fromInputStream(inputStream, contentLength));