Dear Concern,
I think it is doable in good way as you mentioned in your project detail. I am expert in C# Windows Application and also expert in file upload on web. ( As you required)
We need to add this new functionally in current application but in a different way. As it will not just reduce the time of your user but also it will prevent the mistakes that might possible from detail to summary sheet formation.
Apart form this I a Certified PMP (Project Management Professional) & Scrum (Agile) Professional offering services as Full Stack Developer (Frontend & BackEnd), having hands-on experience of developing small, medium and enterprise level solutions over the years which included complex solutions (ERP, Accounting System, Payroll, CRM, HRMS, Tax e-Filing Systems of my country etc) for more than 10 years now.
My expertise are in Technologies including .Net, ASP.Net, .Net Core, C#, ASP Classic, VB 6.0, VB.Net, VBA, MVC, Entity Framework, Jquery & Javascript, React.Js, Ajax, CSS, HTML5, Bootstrap, Web Services & API's, Crystal Reports, MS Access, MS SQL Server, MySQL, MariaDB.
I am a self-starter with CAN DO attitude and can manage projects and tasks with very little or no guidance.
I can start right away. I am looking for a long-term relationship based on Quality of Work, Professionalism and Honesty.
Looking forward to hear from you.
Have a good day!