Fileupload blocked by ASM-policy

One option is to disable the specific attack signature on the specific parameter in question. You can review the ASM logs (Event Logs > Application > Requests) to find the specific block and then click the "learn" button listed beside the "Attack Signature Detected" link. This will take you to a screen that shows the specific parameter in question and will prompt you to create the parameter and disable that specific attack signature. If the issue at hand is simply one parameter getting caught by one specific attack signature, this should solve the problem. If it's more than this, let me know and I can try to help with other solutions.