Update app.py

app.py

@@ -231,7 +231,7 @@ def demo():
 
         def process_pdfs():
             # List all PDF files in the directory
-            pdf_files = [os.path.join(pdf_directory, file) for file in os.listdir(pdf_directory) if file.endswith(".pdf")]
+            pdf_files = [os.path.join(pdf_directory, file) for file in os.listdir(pdf_directory) if file.endswith(".txt")]
             return pdf_files
             
         # Create a dictionary with the necessary information