Safari 11 blocks Flash file browse

Since no error is thrown and browse still returns true, if you wish to detect if Safari blocks the browse popup you can do as follow:

private function onBrowse():void

{

    _browseTime = getTimer();

    _fileRef.browse();

    _fileRef.addEventListener(Event.SELECT, onFilesSelected);

    _fileRef.addEventListener(Event.CANCEL, onFilesCancel);

}

private function onFilesCancel(e:Event):void

{

    if (getTimer() - _browseTime < 100) {

          //do whatever seems fit

    }

}