Similar to this issue.
Using AFNetworking 2.0.3 and trying to upload an image using AFHTTPSessionManager\'s POST + constructingBodyWithBlock. For reasons unknown, it se
I was running into this problem myself, and was trying both methods and the suggested method here...
Turns out, it was as simple as changing the appended data "name" key to "file" instead of the filename variable.
Be sure your data key matches, or you will see the same symptom of an empty data set.