Fix upload flow indentation; show prompt when no image uploaded

app.py

@@ -60,12 +60,14 @@ def run_streamlit_ui():
     uploaded_file = st.file_uploader("Choose image", accept_multiple_files=False, type=["png", "jpg", "jpeg"])
 
     if uploaded_file is not None:
-    
-    if st.session_state.reuse_image is not None:
-        img_input = Image.fromarray(st.session_state.reuse_image)
+        if st.session_state.reuse_image is not None:
+            img_input = Image.fromarray(st.session_state.reuse_image)
+        else:
+            bytes_data = uploaded_file.getvalue()
+            img_input = Image.open(BytesIO(bytes_data)).convert("RGBA")
     else:
-        bytes_data = uploaded_file.getvalue()
-        img_input = Image.open(BytesIO(bytes_data)).convert("RGBA")
+        st.info("Please upload an image to begin.")
+        return
 
     # Resize the image while maintaining aspect ratio
     max_size = 2000