Hey Robert,
Thanks for the reply.
Im actually doing this in objective-c on the iphone.
I exportTileCacheWithParameters from a URL.
On the phone itself, the tpk file is getting saved, but as 10RandomString.tpk, 1234567890.tpk
What im doing right now is going through the document path, finding the tok file, and renaming it. Seems to work for now.