<ul><li>TikTok has a bug causing video thumbnails on your profile page to turn grey sometime after posting.</li><li>The issue occurs when a custom thumbnail is chosen instead of the default one selected by TikTok.</li><li>To fix grey video thumbnails, edit the video once published and choose another frame for the thumbnail.</li><li>Videos with HDR color may cause the TikTok interface to appear grey, and currently, there is no solution for this problem.</li></ul>

How to fix grey video thumbnails on TikTok

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