To maintain session_state after coming back from other pages

i have created an app where the app has and pages like home and un . in un i upload video and do some basic skipping, after clicking home in button i navigate to home, then after returning to the un from home the video data i uploaded vanishes. Please Guide me how can i do it. i also added the session_state but its not mainting itPreformatted text

ill share the code:

import streamlit as st
from lyrics import lyric
from lyrics import eve_odd
from streamlit_extras.switch_page_button import switch_page
js = '''
    var body = window.parent.document.querySelector(".main");
    body.scrollTop = 0;

with st.container():
    vid=st.file_uploader("upload a file", type="mp4")

container_placeholder = st.container()


goToHome, left, middle, backtotop ,right=st.columns(5)
if vid:
    with left:

    with middle:

    with right:

    with backtotop:
    with goToHome:

    if "counter" not in st.session_state:

    with container_placeholder:
        if vid is not None:
            if click1:
                st.session_state.counter = 15
      , start_time=st.session_state.counter)
            elif click2:
                st.session_state.counter = 30
      , start_time=st.session_state.counter)
            elif refresh:
      , start_time=st.session_state.counter)
                st.markdown("<a href='http://localhost:8501/' target='_blank'>Click here to refresh</a>", unsafe_allow_html=True)
            elif back:
      , start_time=st.session_state.counter)
            elif home:
      , start_time=0)

import streamlit as st
import time
from streamlit_extras.switch_page_button import switch_page



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js = '''
    var body = window.parent.document.querySelector(".main");
    body.scrollTop = 0;

if st.button("Back to top"):
    temp = st.empty()
    with temp:
        time.sleep(.5) # To make sure the script can execute before being deleted

import streamlit as st

def main():
    st.title("Streamlit Multi-pages")
    st.subheader("Main Page")

if __name__ == '__main__':

Your code below is incorrect.

vid=st.file_uploader("upload a file", type="mp4")

But your intention to save the object is right.

To make this code correct, we have to check if vid is not None.

vid = st.file_uploader("upload a file", type="mp4")
if vid is not None: = vid

So now we stored the vid that is not None in session_state. When you navigate to other pages, you can access it through session state video.

However, there is no guarantee that this will work all the time. The uploaded file (stored in RAM) then stored in can be lost. There can be optimization or design decision, etc. done in session state management that other variables are not kept. Huge file size, memory limit exceeded, etc.

The proper way to get hold of the uploaded file is to store it somewhere else. For example you can save the file in SnowFlake, Deta Space drive, google cloud, etc.