Update app.py

app.py

@@ -54,8 +54,10 @@ if pdf_source == "Upload a PDF file":
         st.session_state.vector_created = False
 
 elif pdf_source == "Enter a PDF URL":
-    pdf_url = st.text_input("Enter PDF URL:", value = "https://arxiv.org/pdf/2406.06998")
-    if pdf_url and not st.session_state.pdf_path:
+    pdf_url = st.text_input("Enter PDF URL:", value="https://arxiv.org/pdf/2406.06998", key="pdf_url")
+
+    # Button to manually trigger the download
+    if st.button("Download and Process PDF") or pdf_url.strip() != "" and st.session_state.get("pdf_path") is None:
         with st.spinner("Downloading PDF..."):
             try:
                 response = requests.get(pdf_url)
@@ -63,9 +65,12 @@ elif pdf_source == "Enter a PDF URL":
                     st.session_state.pdf_path = "temp.pdf"
                     with open(st.session_state.pdf_path, "wb") as f:
                         f.write(response.content)
+
+                    # Reset states
                     st.session_state.pdf_loaded = False
                     st.session_state.chunked = False
                     st.session_state.vector_created = False
+
                     st.success("✅ PDF Downloaded Successfully!")
                 else:
                     st.error("❌ Failed to download PDF. Check the URL.")