打开微信进入收藏页面，然后选中想要发表的长视频，点击分享到朋友圈，最后点击发表即可。具体操作方法如下：

1、首先打开微信首页，然后点击右下角的我。

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2、打开页面后，点击收藏。

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3、打开收藏页面后，点击右上角的+号。

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4、打开页面后，点击图片标志，如图所示。

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5、打开页面后，点击左下角的图片和视频，然后选中想要发表的长视频。

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6、选中长视频后，点击右上角的完成。

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7、在弹出来的功能表中，选择分享到朋友圈。

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8、点击发表即可。

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注意事项

1、长视频发表前，可以在输入栏中，输入文字再发表。

2、打开图片和视频页面后，可以任意选择长视频。