Update app.py

app.py

@@ -257,7 +257,7 @@ class PaperDownloader:
               os.rename(filepath,filepath_unique)
               downloaded_files.append(filepath_unique)
             else:
-               failed_dois.append(doi)
+               failed_dois.append(f"{doi} (https://doi.org/{doi})")
 
 
         if downloaded_files:
@@ -315,11 +315,10 @@ class PaperDownloader:
                     downloaded_files.append(filepath)
                     logger.info(f"Successfully downloaded: {filename}")
                 else:
-                    failed_dois.append(doi)
-                    logger.warning(f"Could not download: {doi}")
+                     failed_dois.append(f"{doi} (https://doi.org/{doi})")
 
             except Exception as e:
-                failed_dois.append(doi)
+                failed_dois.append(f"{doi} (https://doi.org/{doi})")
                 logger.error(f"Error processing {doi}: {e}")
 
         # Create ZIP of downloaded papers