🚨 Final UTF-8 fix: safe file handling for NamedString

app.py

@@ -68,20 +68,15 @@ def extract_text(file_path, ext):
 def process_file(file):
     global vectorstore
     try:
-        ext = os.path.splitext(file.name)[1].lower()
+        ext = os.path.splitext(getattr(file, "name", "file.pdf"))[1].lower()
         with tempfile.NamedTemporaryFile(delete=False, suffix=ext) as tmp:
-            # ✅ Safely convert input into bytes
+            # Safely get bytes
             if hasattr(file, "read"):
                 file_bytes = file.read()
-            elif isinstance(file, str) and os.path.isfile(file):
-                with open(file, "rb") as f:
-                    file_bytes = f.read()
             elif isinstance(file, bytes):
                 file_bytes = file
             else:
-                # Fallback: try encoding a safe version of its name
-                safe_name = getattr(file, "name", "fallback.txt")
-                file_bytes = safe_name.encode("utf-8", errors="ignore")
+                return "❌ Error: Unsupported file type."
 
             tmp.write(file_bytes)
             tmp.flush()
@@ -100,6 +95,7 @@ def process_file(file):
 
 
 
+
 def generate_prompt(context, question):
     return f"""
 You are a helpful academic tutor assisting a student strictly based on course slides or textbook material.