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Basic flow diagram

Worker Processing
Queue Layer
API Layer
File Exists
File Doesn't Exist
More than 40MB
≤40MB
API
Queue Job in SQS
Return Immediate Response
SQS Queue
Worker
Parse Request
Check S3 for Existing File
Get File from S3
Send Email with Attachment/Download Link
Download from YouTube
File Size Check
Process Large File
FFmpeg Conversion
Upload to S3
Send Download Link via Email
FFmpeg Conversion
Send Email with Attachment
Upload to S3
End Job
Error Handler
Send Error Email
User