Filepicker not working in web browser

[pamraman2009]

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Describe the bug

filepicket not working in web browser please help

Code sample

Code

from flet import *
class user_pdf_pg(UserControl):
    def __init__(self):
        super(user_pdf_pg, self).__init__()
    def build(self):
        self.mypdf = Column(scroll="always")
        self.progress_ring = ProgressBar(width=500, height=16, visible=False)
        self.ring_container = Container(content=self.progress_ring)

        self.saveme = FilePicker(on_result=self.mysavefile)

        for trade in list_of_trd:
            print(trade)
            self.mypdf.controls.append(
                ListTile(
                    leading=Icon(name="picture_as_pdf"),
                    title=Text(f"Generate Trade Report"),
                    trailing=IconButton(
                        icon=icons.DOWNLOAD,
                        on_click=self.save_file
                    )
                )
            )

        self.page.overlay.append(self.saveme)

        return Container(
            expand=1,
            content=Column([
                self.ring_container,
                self.mypdf,
            ]),
        )

    def save_file(self, e):
        self.saveme.save_file()
        print('---save_file called---')

    def mysavefile(self, e: FilePickerResultEvent):
        print('---mysavefile called--**************************-')
        save_location = e.path
        print(f"FilePicker result: {e}")
        self.page.update()


def main(page: Page):
    page.title = "PDF Report Generator"
    page.add(user_pdf_pg())


app(target=main, view=WEB_BROWSER)

To reproduce

assert self.__page, "Control must be added to the page first."
AssertionError: Control must be added to the page first.

Expected behavior

No response

Screenshots / Videos

Captures

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Operating System

Linux

Operating system details

ubuntu 22.04

Flet version

0.23.2

Regression

Yes, it used to work in a previous Flet version (please specify the version in additional details)

Suggestions

No response

Logs

Logs

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Additional details

No response

[covixx]

Could you provide list_of_trd

[pamraman2009]

list_of_trd = [[{"a":1}, {"b":2}], [{"c":3}]]