Not an authorized file extensionIssue While attaching Docx attachment to a form from the UI, the below exception is being thrown "Not an authorized file extension " though the docx extension is added in the allowed list of attachment extensions. CauseBelow exceptions can be seen from the app node logs while attaching the problematic attachment. 2020-12-06 21:07:39 (036) API_INT-thread-3 832CEC7B1B702050BDC93227DC4BCB48 txid=035e2c7f1b70 WARNING *** WARNING *** Security restricted: No extension found, actual type is defined in allowed extensions.2020-12-06 21:07:39 (036) API_INT-thread-3 832CEC7B1B702050BDC93227DC4BCB48 txid=035e2c7f1b70 WARNING *** WARNING *** Security restricted: is not an authorized file extension2020-12-06 21:07:39 (039) API_INT-thread-3 832CEC7B1B702050BDC93227DC4BCB48 txid=035e2c7f1b70 #387987 [REST API] RESTAPIProcessor : is not an authorized file extensionResolutionIn order to overcome this issue, you should not use the special characters in the attachment name. Special characters are not allowed in the attachment name.