(please help) having problem in my code

Description of the Bug

1.Hi Developers im new to coding. i tried to make this video uploading app to my firebase storage but im not that good at coding so im stuck at this problem. when upload button is pressed the filechooser is opened and if i select a file it gets uploaded to the firebase But if i cancel and close the filechooser it gives an error.
2. i am unaware if this file chooser works on android or nor...if it does not please help me with this code too. im stuck on this since 6 January ,thats how poor i am.

Code

from kivy.app import App
from kivy.lang import Builder

kv = '''
<MainScreen>:
    name: 'mainscreen'
    MDLabel:
        id:username_info
        text:'Hello Main'
        font_style:'H1'
        halign:'center'

    MDFloatLayout:
        id:floate
        Video:
            id:vid

        MDToolbar:
            title: 'Bottom navigation'
            md_bg_color: .2, .2, .2, 1
            specific_text_color: 1, 1, 1, 1
        MDBottomNavigation:
            panel_color: 1,1,1,1
            MDBottomNavigationItem:
                name: 'screen 1'
                text: 'Home'
                icon: 'home-outline'
                MDRaisedButton:
                    id:upload
                    text:'Upload'
                    pos_hint:{'center_x':.5, 'center_y':.4}
                    on_release:
                        app.file_chooser()
                        upload.disabled=False
'''


class goodApp(MDApp):

    def build(self):
        self.strng = Builder.load_string(help_str)
        self.url  = "link.json"
        return self.strng

    def file_chooser(self):
        filechooser.open_file(on_selection=self.selected)        
    def selected(self,selection):
        config={
              'Api keys of firebase'
        }

        firebase=pyrebase.initialize_app(config)
        storage=firebase.storage()            
        Directory=selection[0]
        Name=re.findall('[ \w-]+\..*',Directory)
        loginEmail = self.strng.get_screen('loginscreen').ids.login_email.text
        storage.child(str(f"{loginEmail}")).child(str(f"{Name}")).put(str(f"{Name[0]}"))

        if selection==True:
            self.root.ids.vid.source=firebase
            self.strng.get_screen('mainscreen').ids.upload.disabled=True
            self.strng.get_screen('mainscreen').manager.current ='uploadscreen'
            self.strng.get_screen('mainscreen').manager.transition.direction='left'            

        if selection==False:
            self.strng.get_screen('mainscreen').ids.upload.disabled=False



if __name__ == '__main__':
    goodApp().run()

Logs

[INFO ] [Logger ] Record log in C:\Users\Dheeraj.kivy\logs\kivy_22-01-19_1.txt
[INFO ] [deps ] Successfully imported "kivy_deps.angle" 0.3.0
[INFO ] [deps ] Successfully imported "kivy_deps.glew" 0.3.0
[INFO ] [deps ] Successfully imported "kivy_deps.sdl2" 0.3.1
[INFO ] [Kivy ] v2.0.0
[INFO ] [Kivy ] Installed at "C:\Users\Dheeraj\AppData\Roaming\Python\Python38\site-packages\kivy_init_.py"
[INFO ] [Python ] v3.8.10 (tags/v3.8.10:3d8993a, May 3 2021, 11:48:03) [MSC v.1928 64 bit (AMD64)]
[INFO ] [Python ] Interpreter at "C:\Users\Dheeraj\AppData\Local\Programs\Python\Python38\pythonw.exe"
[INFO ] [Factory ] 186 symbols loaded
[INFO ] [KivyMD ] 0.104.2, git-bc7d1f5, 2021-06-06 (installed at "C:\Users\Dheeraj\AppData\Local\Programs\Python\Python38\lib\site-packages\kivymd_init_.py")
[INFO ] [Image ] Providers: img_tex, img_dds, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO ] [Text ] Provider: sdl2
[INFO ] [Window ] Provider: sdl2
[INFO ] [GL ] Using the "OpenGL" graphics system
[INFO ] [GL ] GLEW initialization succeeded
[INFO ] [GL ] Backend used
[INFO ] [GL ] OpenGL version <b'2.1 Mesa 10.0.2 (git-675cd84)'>
[INFO ] [GL ] OpenGL vendor <b'VMware, Inc.'>
[INFO ] [GL ] OpenGL renderer <b'Gallium 0.4 on llvmpipe (LLVM 3.4, 128 bits)'>
[INFO ] [GL ] OpenGL parsed version: 2, 1
[INFO ] [GL ] Shading version <b'1.30'>
[INFO ] [GL ] Texture max size <8192>
[INFO ] [GL ] Texture max units <16>
[INFO ] [Window ] auto add sdl2 input provider
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
[INFO ] [KivMob ] init called.
[WARNING] [KivMob ] Ads will not be shown.
[INFO ] [GL ] NPOT texture support is available
[INFO ] [Video ] Provider: null(['video_ffmpeg', 'video_ffpyplayer'] ignored)
[INFO ] [Base ] Start application main loop
Traceback (most recent call last):
File "C:\Users\Dheeraj\AppData\Roaming\Python\Python38\site-packages\plyer\platforms\win\filechooser.py", line 102, in run
self.fname, _, _ = win32gui.GetOpenFileNameW(**args)
pywintypes.error: (0, 'GetOpenFileNameW', 'No error message is available')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Users\Dheeraj\AppData\Roaming\Python\Python38\site-packages\plyer\platforms\win\filechooser.py", line 108, in run
self._handle_selection(self.selection)
File "C:\Users\Dheeraj\Desktop\kivy codes\Dheeraj.py", line 949, in selected
Directory=selection[0]
IndexError: list index out of range
[INFO ] [Base ] Leaving application in progress...

Screenshots

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Versions

• OS: win 7 pro
• Python: 3.7
• Kivy: latest
• KivyMD: latest (update everyweek)

先从所提供应用程序代码中的 file_chooser() 和 selected(selection) 开始，然后检查 Plyer Windows filechooser traceback。确定 chooser 被取消时的预期行为，以及 Android 是否在范围内；应在更改 upload flow 之前定义 done，并且应考虑日志中显示的空选择。