Custom part_size and parallel upload in chunkeduploads?

Hi,

This question was answered in this forum quite a while back (3 years ago) and I'm looking to see if there's any change since then.

When using the manual chunkeduploader (https://github.com/box/box-python-sdk/blob/main/docs/usage/files.md#manual-process) is it possible to change the part_size?

The above question comes from what I'm seeing when uploading a 50GB file using the Python SDK. The create_upload_session call creates 800 parts for this 50 GB file which takes over 3-4 hours to upload.

A follow-up is if the part sizes cannot be customized, is it advisable to parallel upload sections of it together (10-20 at a time)? If yes, please advise any documentation/example on how this can be done.