protected $imageValidate = 'filesize:2097152|fileExt:jpg,jpeg,png,gif|fileMime:image/jpeg,image/gif,image/png';
修改为 protected $imageValidate = 'filesize:2097152|fileExt:jpg,jpeg,png,gif,pem|fileMime:image/jpeg,image/gif,image/png,text/plain';
433行validate([$fileName => self::$imageValidate])->check([$fileName => $file]);
修改为validate([$fileName => $this->imageValidate])->check([$fileName => $file]);