I spent a little time at the issue of looking uploading files with ActionScript 3. Here's Adobe's documentation on the issue:
Adobe 3 Action script-Loading Data
You are running on a shared server where you do not have root access (and cannot obtain it) - so any script that is going to run will require authentication before it can successfully connect to upload data. Per the documentation from Adobe:
Note: If your server requires user authentication, only SWF files running in a browser—that is, using the browser plug-in or ActiveX control—can provide a dialog box to prompt the user for a user name and password for authentication, and only for downloads. Flash Player does not allow uploads to a server that requires user authentication.
Per their notes, it is not permitted.
If you have any further questions, please contact technical support or leave a comment at the bottom of the page.
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