How to upload files to the subfolders of subfolders.

[isCopyman]

du.configure_upload(app, folder='temp')
du.Upload(
text_completed='Upload completed',
filetypes=['xlsx'],
max_files=10,
id='uploader'
upload_id = 'user1'
),

with this, I can upload file to temp/user1
But how to upload file to temp/user1/another_folder

[isCopyman]

https://github.com/np-8/dash-uploader/issues/45
I solved this problem. just add '/' after the upload_id , it will create a new folder.
This problem occurred because upload_ id and component id has some bugs. changing the upload_ id didn't work, so I directly created a new upload component.