I want to only upload a file once.

Using Streamlit
1

Hello all,
I am developing an app that allows users to upload a file to Pinecone, I have the actual uploading logic to run in the background, however, I want to remove the already uploaded files from the file_uploader widget.

Here is my code, I would greatly appreciate it if anyone has any suggestions.

def upload_and_process_files(index, openai_client, backend):
    """Render file upload UI and process files for indexing"""
    st.header("Upload & Index Files")

    # Initialize session state for file uploader
    if "file_uploader_key" not in st.session_state:
        st.session_state.file_uploader_key = str(uuid.uuid4())

    files = st.file_uploader(
        "Select files (txt, pdf, pptx)",
        type=["txt", "pdf", "pptx"],
        accept_multiple_files=True,
        key=st.session_state.file_uploader_key  # unique key to reset
    )

    if not files:
        st.info("Upload files to index them for question answering")
        return

    upload_successful = False

    files_to_process = list(files)

    for f in files_to_process:
        if f.name in backend.tag_manager.get_files():
            st.warning(f"'{f.name}' already indexed — skipping.")
            continue


        if backend.tag_manager.add_tag(f.name):
            temp = tempfile.NamedTemporaryFile(delete=False,
                                               suffix=Path(f.name).suffix)
            temp.write(f.getbuffer())
            temp.close()

            subprocess.Popen([
                sys.executable, "background_tasks/background_indexer.py",
                temp.name,  # path, not text
                backend.tag_manager.selected_name,
                backend.tag_manager.user_name,
                str(backend.tag_manager.selected_category_id),
                f.name
            ])

            with st.spinner(f"Indexing {f.name}…"):
                while backend.tag_manager.get_not_completed_files(f.name):
                    time.sleep(1)
                files.remove(f)
                print(f"it is done indexing: {f.name}")

            st.success(f"{f.name} indexed!")
        else:
            st.write("Tagging failed")

    # ✅ Reset file uploader after successful upload
    if upload_successful:
        st.session_state.file_uploader_key = str(uuid.uuid4())