How do i presign url parts?

[patchthecode]

I was using the GO version AWS-sdk until Swift finally came out.

How do I presign url parts?

Use case: I have an app where users can upload images.
My front end splits the image/video into multiple parts.
Lets say for example a large file was split into 7 parts for upload.

My GO server would then presign 7 URLs with an uploadID and return it to the front end app.
The app would then upload the 7 parts once complete the GO server would call the s3.CompleteMultipartUpload function and aws would then combine the 7 files.

How can I do this in Swift?
I want to presign multipart urls