Amazon S3 File Gateway (AWS Storage Gateway) exposes an on-premises NFS/SMB file share that durably stores files as S3 objects with local caching, enabling low-latency writes on-premises and asynchronous, near- real-time ingestion into Amazon S3 for analytics. It is purpose-built to "present a file interface backed by Amazon S3" and to "store files as objects in your S3 buckets," so existing applications writing to a network share can transparently land data in S3 without custom scripts or job orchestration. Compared with scheduled transfers (e.g., end-of-day DataSync), S3 File Gateway continuously uploads new/changed files, better meeting the near-real-time requirement. Transfer Family (SFTP) would require custom polling and client changes, increasing operational burden. DataSync is excellent for bulk or periodic migrations
/synchronizations but is not as seamless for continuous ingestion from a live file share. Therefore, updating the application to point to an S3 File Gateway share provides the simplest, performant path to near-real-time delivery into S3 for downstream analytics.
References: AWS Storage Gateway User Guide - "What is Amazon S3 File Gateway," "How S3 File Gateway works," "File share protocols (SMB, NFS)," "Object creation and upload behavior," and AWS Well- Architected - Analytics ingestion patterns.

The issue is most likely that messages become visible in the queue again before Lambda finishes processing them. AWS documents that when Lambda polls SQS, messages remain hidden only for the queue's visibility timeout, and if they are not deleted before that timeout expires, they can be retrieved again and reprocessed.
AWS specifically recommends setting the SQS visibility timeout to at least six times the Lambda function timeout, and if a batch window is used, to add that value as well. Long polling reduces empty receives but does not prevent duplicate processing. Changing to FIFO is unnecessary here, and deleting messages before successful processing risks data loss.

The requirement is to route users to the nearest AWS Region where the application is deployed. The best solution is to use Amazon Route 53 with a geolocation routing policy, which routes traffic based on the geographic location of the user making the request.
Geolocation Routing: This routing policy ensures that users are directed to the resources (in this case, EC2 instances) that are geographically closest to them, thereby reducing latency and improving the user experience.
Application Load Balancer (ALB): Within each Region, an internet-facing Application Load Balancer (ALB) is used to distribute incoming traffic across multiple EC2 instances in different Availability Zones. ALBs are designed to handle HTTP/HTTPS traffic and provide advanced features like content-based routing, SSL termination, and user authentication.
Why Not Other Options?:
Option B (Geoproximity + NLB): Geoproximity routing is similar but more complex as it requires fine-tuning the proximity settings. A Network Load Balancer (NLB) is better suited for TCP/UDP traffic rather than HTTP/HTTPS.
Option C (Multivalue Answer Routing + ALB): Multivalue answer routing does not direct traffic based on user location but rather returns multiple values and lets the client choose. This does not meet the requirement for geographically routing users.
Option D (Weighted Routing + NLB): Weighted routing splits traffic based on predefined weights and does not consider the user's geographic location. NLB is not ideal for this scenario due to its focus on lower-level protocols.
AWS References:
Amazon Route 53 Routing Policies- Detailed explanation of the various routing policies available in Route
53, including geolocation.
Elastic Load Balancing- Information on the different types of load balancers in AWS and when to use them.

Amazon FSx for Windows File Server supports Multi-AZ deployment for higher availability and automatic failover across Availability Zones. Because the existing file system was created as a Single- AZ deployment, the practical migration path is to create a new Multi-AZ FSx for Windows File Server file system and migrate the data. AWS DataSync is the appropriate managed service for transferring file data between file systems, including SMB-based storage. AWS Transfer Family is for managed file transfer protocols such as SFTP, FTPS, and FTP, not for replicating an FSx Windows file system for migration. AWS DMS is for database migration, not file-system migration. Simply shutting down the existing file system does not convert the deployment type in place.

* CloudFront Signed URLs: These URLs allow you to provide limited access to content that is being served through an Amazon CloudFront distribution. Signed URLs can be generated to grant time- limited access to premium customers.
* Content Restriction:
* By using CloudFront signed URLs, you can control access to your media streams and file content stored in S3.
* These URLs can be customized with an expiration time, ensuring that access is only available for a specific period, which is useful for scenarios like movie rentals or music downloads.
* Security and Flexibility:
* Signed URLs ensure that only authenticated users (premium customers) can access the restricted content.
* This approach integrates seamlessly with CloudFront and S3, providing an efficient way to manage access controls without additional overhead.
* Operational Efficiency: Using CloudFront signed URLs leverages AWS managed services to handle the complexity of access control, reducing the need for custom implementation and maintenance.
References:
* Serving Private Content with Signed URLs and Signed Cookies