public void setAlwaysCalculateMultipartMd5(boolean alwaysCalculateMultipartMd5) {
        this.alwaysCalculateMultipartMd5 = alwaysCalculateMultipartMd5;
    }
Set to true if Transfer Manager should calculate MD5 for multipart uploads.
<p>
For instance, if a bucket is enabled for Object Locking, put requests for
objects and object parts must contain an MD5 digest. Since Transfer Manager
operates on a whole object, the user cannot supply the MD5
digest directly if multipart uploads are in effect.

<p>
Supplying any object locking parameter also instructs Transfer Manager
to calculate MD5 for parts. This flag should be used in instances where
they are not present.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/transfer/TransferManagerBuilder.java