Case Study: Secure File Upload Solution for Sensitive Healthcare Data

About the client: The client is a well-established company in the medical sector. Their business involves the processing and transfer of confidential healthcare and financial information; thus secure, compliant data handling becomes an essential part of their business. 

The Project: The client worked with ACT360 in January 2025 to create a secure file upload system on their WordPress website. The objective was to achieve a smooth but extremely secure process for users to upload sensitive documents while meeting high levels of data protection requirements in healthcare and the legal professions. 

This wasn't just a convenience issue; it was about building trust and delivering end-to-end security for individual data. The solution had to handle large file transfers (up to 2GB), steer clear of security threats, and integrate smoothly with the company's existing Microsoft SharePoint infrastructure, all without compromising on performance. 

Objective 

The goal was to deliver a secure, scalable, and user-friendly file transfer solution that met five core criteria: 

1. End-to-End Data Security – All document uploads needed to be encrypted, validated, and transferred using enterprise-grade protocols. 

1. Large File Handling – The platform had to support files of up to 2GB with zero timeout or performance issues. 

1. Compliance – The system should adhere to healthcare industry compliance best practices and regulations. 

1. SharePoint Integration – Files must be processed directly into SharePoint via modern APIs and secure authentication. 

1. Efficiency in Operations – The upload operation had to be executed asynchronously, with admin visibility and error reporting built-in. 

Key Tasks and Solutions 

Custom WordPress Plugin Development
ACT360 developed a custom WordPress plugin that was designed to manage the complete lifecycle of secure uploads.  

Large File Uploads using Microsoft Graph API
To bypass SharePoint's file size limitations, the team employed chunked uploads using the Microsoft Graph API. The system divides each file into its smaller component chunks, securely uploads them, and then rebuilds them on SharePoint, supporting uploads of over 2GB fully. 

Asynchronous Processing & Background Tasks
Server timeouts are avoided, and reliability is improved, by processing uploads in the background using asynchronous task handlers. This prevents freezing of the site, even for big transfers. 

Multi-Layered Security Features
From temporary file storage automatic cleanup to directory traversal protection and content-type checking, the platform is layered with many forms of protection. Admins are also alerted to errors or unexpected behavior via real-time system notifications.

Comprehensive Logging and Admin Oversight
Every stage of the upload, from file start to SharePoint delivery, is logged. This not only helps in tracking issues but also ensures accountability and traceability for compliance audits. 

Outcomes 

The solution has transformed the client’s document workflow. Patients and legal partners can securely upload large files with ease, while administrators have detailed logs, error alerts, and secure storage in their SharePoint system. Key outcomes: 

• Reduced admin workload by streamlining file management. 

• Complied with data protection and handling requirements. 

• Improved system stability during uploads with background processing. 

• Eliminated third-party tools or insecure email file submissions. 

“ACT360 delivered exactly what we needed, a secure, efficient, and easy-to-manage upload solution. The process is now seamless for both our team and our users.”
— The client’s Team 

Conclusion 

This project showcases ACT360's proficiency at integrating custom development, enterprise-class security, and performance optimization in one smooth solution. With extensive knowledge of the client’s processes, ACT360 offered a tailor-made solution suited to healthcare compliance, ease of use for users, and business efficiency. 

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