Create Attachment: Create Upload URL

Returns an AWS S3 URL upon success for subsequent file uploads. On a successful response, execute a PUT request to the AWS S3 URL with the file.

Knowledge Base Example: https://help.linksquares.com/hc/en-us/articles/10849398433559-Analyze-API-Sample-Use-Cases#01H7AP6S3SDSWKYEZPT4JCS1KZ

AWS Documentation: https://docs.aws.amazon.com/AmazonS3/latest/userguide/PresignedUrlUploadObject.html