Upload large size file

Hi,

I have two files: one around 77MB, one around 82MB. I am using C# chunk uploading function "FilesManager.UploadUsingSessionAsync".  For 77MB file, one call of "FilesManager.UploadUsingSessionAsync" successfully uploaded the file to my enterprise Box. For 82MB, one time upload didn't work. I have been calling multiple times of  "FilesManager.UploadUsingSessionAsync" after the exception is thrown. It  has been 15 minutes with 4 calls. The file is still not uploaded yet. Any suggestions on how to upload large size file around 100MB using C# API? Should I use FTP.Box.com?

Thanks.

Joy