getvalue -> getvalue:

app.py

@@ -34,7 +34,7 @@ with st.sidebar.form("file-uploader-form", clear_on_submit=True):
     uploaded_file = st.file_uploader("Choose a file")
     submitted = st.form_submit_button("Submit")
     if uploaded_file is not None and submitted:
-        uploaded_image = Image.open(io.BytesIO(uploaded_file.get_values()))
+        uploaded_image = Image.open(io.BytesIO(uploaded_file.getvalue()))
 
 if uploaded_image is None and submitted:
     st.write("Please select a file to upload")