Preview fix: use iframe with served /file= path; add explicit PDF file output; normalize all yields to 5 outputs

app.py

@@ -499,6 +499,19 @@ def _pdf_to_iframe_html(pdf_path: Path, width="100%", height="900px") -> str:
     except Exception:
         return ""
 
+def _pdf_to_iframe_file(pdf_path: Path, width="100%", height="900px") -> str:
+    try:
+        from urllib.parse import quote
+        p = str(pdf_path)
+        src = f"/file={quote(p)}"
+        return (
+            f"<div style='border:1px solid #ddd;border-radius:8px;overflow:hidden'>"
+            f"<iframe src='{src}' width='{width}' height='{height}' style='border:0'></iframe>"
+            f"</div>"
+        )
+    except Exception:
+        return ""
+
 def _compile_tex_to_pdf(tex_path: Path, logs):
     """Generic TeX compile helper for a .tex file. Returns Path to PDF or None."""
     try:
@@ -1161,7 +1174,8 @@ def run_pipeline(arxiv_url, pdf_file, openai_key, logo_files, meeting_logo_file,
     try:
         pdf_path = _compile_poster_pdf(OUTPUT_DIR, logs)
         if pdf_path and pdf_path.exists():
-            pdf_html = _pdf_to_iframe_html(pdf_path)
+            # Prefer file-served iframe to avoid large data: URIs and browser blocks
+            pdf_html = _pdf_to_iframe_file(pdf_path)
             compiled_pdf_file = str(pdf_path)
             logs.append("🖨️ PDF ready for preview in UI.")
     except Exception as e: