Uploading files with additional information via API to S3

Hi, I’m trying to build an API that lets users upload files, which get then processed. But I encountered the API Gateway Upload limit of 10mb. Now my question is, is it possible to upload a file to S3 with some additional processing informations in a single POST request. Because everything I found on the internet was making the POST request which then returns the signedURL to the S3 Bucket to upload the file. Thanks.