Return work with 1 file

app.py

@@ -35,18 +35,14 @@ def loading_pdf():
 def pdf_changes(pdf_docs, open_ai_key):
     if openai_key is not None:
         os.environ['OPENAI_API_KEY'] = open_ai_key
-        documents = []
-        for file in pdf_docs:
-            loader = OnlinePDFLoader(file.name)
-            documents.extend(loader.load_and_split())
-            print(f'{file} loaded')
-            
+        loader = OnlinePDFLoader(pdf_doc.name)
+        documents = loader.load()
         text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)
         texts = text_splitter.split_documents(documents)
         embeddings = OpenAIEmbeddings()
-        db = Chroma.from_documents(documents, embeddings)
+        db = Chroma.from_documents(texts, embeddings)
         retriever = db.as_retriever()
-        global qa 
+        global qa
         qa = ConversationalRetrievalChain.from_llm(
             llm=OpenAI(temperature=0.5), 
             retriever=retriever,