Hi,
I have read all the requirements carefully and I am the right person for the job.
I have already done similar task for one of my client. I can create one quartz based windows scheduler for you which will check for new files in every half an hour (you can change this frequency) and download all files and save it your DB and server.
I have 3+ years of experience in .NET Framework, .NET Core, C#, XML, JSON, REST and SOAP Web API, MVC framework, JWT Authentication, Azure Cloud Service, Functions App, Mongo DB, Cosmos DB, SQL Server.
Kindly send me all the details for more clarity and the proper deadline for the task.