当扩展服务因为扩展周期而关闭时，新的功能旗帜被取消激活将会禁用上传按钮同时／或者显示关于关闭时间更为有帮助的消息。
When the external service is down for extended periods, a feature flag can be deactivated that would disable the upload button and/or show a more helpful message about the downtime.
检查在激活拾取按钮之后，是否拾取了目标物体，或者操作是否被取消。
Check whether destination object is picked after clicking destination button or the operation is cancelled.
复杂的功能可以被激活或通过预置功能集或手动方式取消。
Complex features can be activated or de-activated by means of pre-set feature sets or manually.
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