I'm using the AWS SDK for Android and iOS to upload images directly to an S3 buckets, but i also need to notify my servers about this upload. AFAIK i have two options:

1 - Make another request after the upload: in this case i first upload the image to S3 and, when i receive the uploaded image URL, i make a request to my server. Pros: all the logic is in one place. Cons: i need to do two requests and implement all the integrity checks if the second request fails.

2 - Make the upload request from the mobile apps and then implement a hook/lamba structure that automatically notifies the server after the upload. Pros: i need to make only one request from the apps. Cons: i need to implement the hook/lambda infrastructure.

What's your opinion? Which solution should i use?