[Python] Why does expressify not show calculations that require an input?

I have a Shiny app in two sections - app.py, the main app, and page.py, because my code is rather long and I don't want it all in one file where I can accidentally nuke the whole thing. The problem is, I have interactive elements. Since I'm using expressify, I think it's refusing to display values if calculations are executed in the same function. Code below:

app.py


import page
from shiny import ui
from shiny.express import input, ui

with ui.navset_tab(id="selected_navset_tab"):
# Homepage
with ui.nav_panel("Welcome", value="page_home"):
with ui.card():
# Variable calculated
ui.input_selectize(
"filler", "Filler",
["list", "of", "items", "here"],
multiple=False
)
# other Nav
page.otherNav()

page.py


from shiny import render
from shiny.express import input, ui, expressify

@expressify
def otherNav():
with ui.nav_panel("Page I want to put in the main app", value="other_page"):
ui.input_numeric("input_value", "I need this inpt value!", 1, min=1, max=1000)
@render.express
def text_to_display(): # this doesn't display anything!
x = input.input_value()
x


How can I get the text to show based on the user input, while keeping the code separate in a different file?

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