bug fix

app.py

@@ -17,7 +17,6 @@ preprocessor = PreProcessor(
 
 
 def pdf_to_document_store(pdf_files):
-    document_store.delete_documents()
     converter = PDFToTextConverter(remove_numeric_tables=True, valid_languages=["en"])
     documents = []
     for pdf in pdf_files:
@@ -30,7 +29,10 @@ def pdf_to_document_store(pdf_files):
 uploaded_files = st.file_uploader("Choose PDF files", accept_multiple_files=True)
 
 if uploaded_files is not None:
-    pdf_to_document_store(uploaded_files)
+    if st.button('Summarize Documents'):
+        document_store.delete_documents()
+        pdf_to_document_store(uploaded_files)
+
 if st.button('Calculate num of docs'):
     st.write(document_store.get_document_count())