How can we upload using Pre-signed url using APPSYnc

i have created a lambda function which is connected to s3 that lambda function
then the lamda function I just connected to APPsync
when I try to upload is that possible to upload a file through APPSYnc in aws?

anyone can we solve this issue for me

The issue mentions a Lambda function, S3, AppSync, and pre-signed URLs but provides no repository files, tests, entry points, or reproducible failure. First clarify the intended upload flow and request the relevant schema, resolver, or Lambda entry point; done would require a documented, reproducible upload path and verification.

Written by the indexing model from the issue text.