Correct streamlit file behavior

Corrected processing of streamlit uploaded file names

app.py

@@ -7,18 +7,18 @@ import time
 
 st.title("Lecturer Support Tool")
 
-file_name = st.file_uploader("Upload an audio of classroom activity to analyze")
+uploaded_file = st.file_uploader("Upload an audio of classroom activity to analyze")
 
 supported_file_types = ['.wav','.mp3','.mp4']
 
-if file_name is not None:
-    if not file_name.endswith(supported_file_types):
+if uploaded_file is not None:
+    if not uploaded_file.name.endswith(supported_file_types):
         st.error('File must be of type: {}'.format(supported_file_types))
-        file_name = st.empty()
+        uploaded_file = st.empty()
     else:
-        st.audio(file_name)
+        st.audio(uploaded_file)
 if st.button("Analyze Audio"):
-    if file_name is None:
+    if uploaded_file is None:
         st.error('Upload a file first!')
     else:
         # Process