Requirements (My hallucinations):
Design and architect a highly available, large user base system which is going to be used by the National Highways, the regular employees updating photos of WIP on different stages and when work completed, archive all images after creating a timeline video. WIP sequence should keep the most latest photo thumbnail linked to a project blog page, with a gallery linking to last photo per day. Post-processing of a completed work can take even up to a week giving more importance to the lowest cost possible. The system should be capable of handling hundreds of thousands of high-quality mobile photographs per day. Runtime costs should be as low as possible. For each WIP a minimum of one photograph in six hours is desired.
Solution on AWS (My views):
Application to be developed in some kind of single-page-app with progressive-web-app support, javascript and CSS libraries. This can be hosted on AWS S3 bucket with Cloud Front default origin pointed here. The standard secure approach of https (Redirect HTTP to HTTPS), OAI and custom domain with certificate from ACM is recommended. Dynamic part uses Cognito User Pool, Amazon API Gateway (regional), Lambda, STS etc. API Gateway stage should be the behaviour point for route.