diff --git a/make_post_sell/lib/torrent.py b/make_post_sell/lib/torrent.py
index 5d47c56..70c4573 100644
--- a/make_post_sell/lib/torrent.py
+++ b/make_post_sell/lib/torrent.py
@@ -156,6 +156,7 @@ def generate_torrent(s3_client, bucket, bundle_name, files, description,
         os.makedirs(bundle_dir)
 
         webseeds = []
+        downloaded = set()  # filenames that actually landed on disk
 
         # 1. Download each file from S3 into the bundle directory.
         for f in files:
@@ -163,6 +164,7 @@ def generate_torrent(s3_client, bucket, bundle_name, files, description,
             log.info("torrent: downloading s3://%s/%s → %s", bucket, f["s3_key"], f["filename"])
             try:
                 s3_client.download_file(bucket, f["s3_key"], local_path)
+                downloaded.add(f["filename"])
             except Exception:
                 log.warning("torrent: skipping missing file s3://%s/%s", bucket, f["s3_key"])
                 continue
@@ -170,25 +172,65 @@ def generate_torrent(s3_client, bucket, bundle_name, files, description,
                 webseeds.append(f["webseed_url"])
 
         # 2. Write index.md + index.html into the bundle directory.
+        # Separate the main file (content/preview) from thumbnails using the
+        # filename prefix — build_bundle_files names them content.*, preview.*,
+        # and thumbnail1..4.*.
+        main_file = next(
+            (f for f in files
+             if f["filename"].startswith(("content.", "preview."))
+             and f["filename"] in downloaded),
+            None,
+        )
+        thumb_files = [
+            f for f in files
+            if f["filename"].startswith("thumbnail")
+            and f["filename"] in downloaded
+        ]
+
         if description:
             with open(os.path.join(bundle_dir, "index.md"), "w", encoding="utf-8") as fh:
                 fh.write(description)
-            try:
-                import markdown
-                html_body = markdown.markdown(description, extensions=["fenced_code", "tables"])
-            except ImportError:
-                # Fallback: wrap raw markdown in a <pre> if markdown lib not installed.
-                html_body = f"<pre>{description}</pre>"
-            html = (
-                "<!DOCTYPE html>\n<html>\n<head>"
-                "<meta charset='utf-8'>"
-                f"<title>{bundle_name}</title>"
-                "</head>\n<body>\n"
-                + html_body
-                + "\n</body>\n</html>\n"
+
+        try:
+            import markdown as _md
+            html_body = _md.markdown(description or "", extensions=["fenced_code", "tables"])
+        except ImportError:
+            html_body = f"<pre>{description}</pre>" if description else ""
+
+        # Thumbnail gallery — relative links, rendered inline.
+        thumb_html = ""
+        if thumb_files:
+            imgs = "".join(
+                f'<a href="{f["filename"]}">'
+                f'<img src="{f["filename"]}" style="max-width:320px;margin:4px" /></a>'
+                for f in thumb_files
             )
-            with open(os.path.join(bundle_dir, "index.html"), "w", encoding="utf-8") as fh:
-                fh.write(html)
+            thumb_html = f'<div class="thumbnails" style="display:flex;flex-wrap:wrap;gap:4px">{imgs}</div>\n'
+
+        # Main file link — download anchor.
+        main_html = ""
+        if main_file:
+            label = "Download" if main_file["filename"].startswith("content.") else "Preview"
+            main_html = (
+                f'<p><a href="{main_file["filename"]}" download>'
+                f'{label}: {main_file["filename"]}</a></p>\n'
+            )
+
+        html = (
+            "<!DOCTYPE html>\n<html>\n<head>"
+            "<meta charset='utf-8'>"
+            f"<title>{bundle_name}</title>"
+            "<style>body{font-family:sans-serif;max-width:800px;margin:2em auto;padding:0 1em}"
+            "img{border-radius:4px}a{color:#16a34a}</style>"
+            "</head>\n<body>\n"
+            f"<h1>{bundle_name}</h1>\n"
+            + thumb_html
+            + main_html
+            + html_body
+            + "\n</body>\n</html>\n"
+        )
+        with open(os.path.join(bundle_dir, "index.html"), "w", encoding="utf-8") as fh:
+            fh.write(html)
 
         # 3. Build multi-file .torrent from the bundle directory.
         t = torf.Torrent(