diff --git a/src/engines/Mastodon.ts b/src/engines/Mastodon.ts
index 755d10b..539beed 100644
--- a/src/engines/Mastodon.ts
+++ b/src/engines/Mastodon.ts
@@ -8,7 +8,6 @@ import {
 
 interface Attachment {
   url: string;          // original media URL, ?sensitive=true stripped
-  previewUrl?: string;  // poster / cached preview (for video posters)
   contentType: ContentType;
 }
 
@@ -100,14 +99,12 @@ export default class Mastodon extends ScrapeEngineBase {
       if (!rawHref) continue;
 
       const img = a.querySelector("img");
-      const preview = img?.currentSrc || img?.src;
 
       const url = this.normalizeUrl(rawHref) || this.largestFromSrcset(img);
       if (!url) continue;
 
       add({
         url,
-        previewUrl: preview && preview !== url ? preview : undefined,
         contentType: this.contentTypeFor(url),
       });
     }
@@ -121,12 +118,8 @@ export default class Mastodon extends ScrapeEngineBase {
       const url = this.normalizeUrl(rawSrc);
       if (!url) continue;
 
-      // Use the poster as a thumbnail when available.
-      const poster = v.getAttribute("poster") || undefined;
-
       add({
         url,
-        previewUrl: poster && poster !== url ? poster : undefined,
         contentType: "video",
       });
     }