[MW 1.28] Error While Storing

When trying to upload a file, I get the error:
`There was an error while storing the file in the stash.`

I can't find anything on this error. Is it fair to assume that this extension doesn't take into account bucket location? I'm not on a default server; I'm using US-East-2 (Ohio).

Tested with both public and private bucket directories. The credentials have been verified to work.