Upload large file in to SQL server filestream

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Hey guys, So I have a process that uploads files from a website and stores them in a datastore currently Azure Blob storage. This all works great but for one of our customers we will be installing the the software on premise and storing in Azure will not be an option.
That brings me to my problem...
I will be storing the files in sql server filestream for this but when the files are large, I split them in to chunks and push them to the server, I want to avoid having to put the data in to a temp folder and merge the chunks after the upload completes, then insert them in to the database. A much better solution would be to stream directly in to the sql server file stream column. I need to know if this is possible as the chunks are posted to the server on different threads.
Any help is very much appreciated

What I have tried:

I have a fully working solution that uploads files to azure