Problem: After deploying a file mobile business object (MBO) that contains only an upload operation to Unwired Server, device applications are unable to successfully access them.
If you create a file MBO that contains only an upload operation, and deploy it to Unwired Server, device applications are unable to access the MBO. That is, even though there is support to create and deploy file MBOs that contain only upload operations in Unwired WorkSpace, there is no runtime support for them at this time.
Solution: Do not try to access file MBOs that contain only upload operations from device applications.