这是因为对方关闭了下载功能，可以通过复制链接到QQ浏览器里面打开。方法如下：
1、打开需要保存的视频，点击左侧的分享按钮。
/iknow-pic.cdn.bcebos.com/b3119313b07eca804b3f269c9e2397dda1448396"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/b3119313b07eca804b3f269c9e2397dda1448396?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/b3119313b07eca804b3f269c9e2397dda1448396"/>
2、在弹出来的选中可看到持存本地是无法点击的，此时可以点击复制链接。
/iknow-pic.cdn.bcebos.com/ac345982b2b7d0a23beb1be6c4ef76094b369aae"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/ac345982b2b7d0a23beb1be6c4ef76094b369aae?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/ac345982b2b7d0a23beb1be6c4ef76094b369aae"/>
3、那链接复制了之后，打开qq浏览器，将链接复制播放视频。
/iknow-pic.cdn.bcebos.com/aa64034f78f0f7361131537a0555b319eac413f9"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/aa64034f78f0f7361131537a0555b319eac413f9?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/aa64034f78f0f7361131537a0555b319eac413f9"/>
4、然后继续点击右上角的三个小圆点。
/iknow-pic.cdn.bcebos.com/d1160924ab18972b73e51fb1e9cd7b899f510ae9"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/d1160924ab18972b73e51fb1e9cd7b899f510ae9?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/d1160924ab18972b73e51fb1e9cd7b899f510ae9"/>
5、在弹出来的选项里面点击下载。
/iknow-pic.cdn.bcebos.com/d31b0ef41bd5ad6e41ce7a918ecb39dbb6fd3c91"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/d31b0ef41bd5ad6e41ce7a918ecb39dbb6fd3c91?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/d31b0ef41bd5ad6e41ce7a918ecb39dbb6fd3c91"/>
6、然后选择普通下载就可以了。
/iknow-pic.cdn.bcebos.com/80cb39dbb6fd526673ff236fa418972bd50736f0"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/80cb39dbb6fd526673ff236fa418972bd50736f0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/80cb39dbb6fd526673ff236fa418972bd50736f0"/>
注意事项：
无法保存视频，还需要查看是不是没有将抖音的应用权限设置打开。