AVFile 调用save的时候提示没有删除文件权限。
App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.
Thread 6, name = (null) | +[AVErrorUtils errorFromJSON:] [Line 197] error: Error Domain=AVOS Cloud Error Domain Code=1 "Forbidden to delete by class permissions." UserInfo={error=Forbidden to delete by class permissions., NSLocalizedDescription=Forbidden to delete by class permissions., code=1}