Index: src/routes/posts.js
===================================================================
--- src/routes/posts.js	(revision 1d6f9a2206f4836d6c91855b6c7c7494cd58c8f4)
+++ src/routes/posts.js	(revision 7ecbefcadbef8833cc853af7af31d391c35fc5da)
@@ -286,5 +286,5 @@
       ActivityPubService.deliverCreate(site, {
         id: postId, slug: finalSlug, title: title || finalSlug,
-        content: cleanContent, cover_image_url: cover_image_url || null,
+        content: cleanContent, cover_image_url: cover_image_url || null, cover_video_url: req.body.cover_video_url || null,
         published_at: publishedAt, created_at: now, fan_only: fanOnly, nsfw, content_warning: cw,
       }).catch(() => { /* best-effort */ });
@@ -417,5 +417,5 @@
     const apPost = {
       id: post.id, slug: finalSlug, title: title || finalSlug,
-      content: cleanContent, cover_image_url: cover_image_url || null,
+      content: cleanContent, cover_image_url: cover_image_url || null, cover_video_url: req.body.cover_video_url || null,
       published_at: publishedAt, created_at: post.created_at, fan_only: fanOnly, nsfw, content_warning: cw,
     };