URLLoader doesn't dispatch PROGRESS event when uploading data, but latest Socket implementation has support for outputProgress Event [1].
Is there any HTTP client which can track upload progress by using outputProgress?
[1] http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/Socket.html#event:outputProgress
AS3HttpClient uses the Socket class to do HTTP, if it doesn't do what you want, it might be the best place to start. There is even an old plea from the developer for Adobe to support outputProgress in Socket
References
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