Exception thrown storing stream in new SqlRemoteBlob:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. 
---> Microsoft.Data.SqlRemoteBlobs.BlobStoreException: 
There was a generic database error. 
For more information, see the included exception. 
---> System.Data.SqlClient.SqlException: 
Invalid format specification: '%hs does not exist.)'
while attempting 'NtCreateFile' on 
'D:\\SQLRBSWSS\_Content13bc3f57-1564-4b1d-98db-dc6008bd7d2366c4d9d9-94d2-4e91-9495-4ac5d4898801000031a-000018f4-0012

Check to make sure the destination folders exist. Mine did not.

My RBS works fine for my root site collection, but I got errors when uploading larger files within a non-root site collection.

I’m suspecting that the RBS Provider (or whatever actually creates the folder structure) didn’t create the necessary subfolders when I created the non-root site collections.

Once I manually created the folders, I was able to upload larger files with no issues.