Correct streamlit file upload

app.py

@@ -9,10 +9,10 @@ st.title("Lecturer Support Tool")
 
 uploaded_file = st.file_uploader("Upload an audio of classroom activity to analyze")
 
-supported_file_types = ['.wav','.mp3','.mp4']
+supported_file_types = ('.wav','.mp3','.mp4')
 
 if uploaded_file is not None:
-    if not uploaded_file.name[0].endswith(supported_file_types):
+    if not uploaded_file.name.endswith(supported_file_types):
         st.error('File must be of type: {}'.format(supported_file_types))
         uploaded_file = st.empty()
     else: