What is the best way to upload a byte[] of a RTF file?

Question

I have a MVVM WPF C# 4.0 .Net application in which I pull down a byte[] of a RTF file stored in a sql server data table. I can pull the byte[] down without any issues but when I try to save it back to the server I get an error message.  The size is 248k.

My question what would be the best way to handle this thru a WCF?