這是因為對方關閉了下載功能，可以通過復制鏈接到QQ瀏覽器裏面打開。方法如下：
1、打開需要保存的視頻，點擊左側的分享按鈕。
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2、在彈出來的選中可看到持存本地是無法點擊的，此時可以點擊復制鏈接。
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3、那鏈接復制了之後，打開qq瀏覽器，將鏈接復制播放視頻。
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4、然後繼續點擊右上角的三個小圓點。
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5、在彈出來的選項裏面點擊下載。
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6、然後選擇普通下載就可以了。
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註意事項：
無法保存視頻，還需要查看是不是沒有將抖音的應用權限設置打開。