FilePickerUploadEvent Inherits: Event['FilePicker'] Properties error(str | None) – An error message if the upload failed. file_name(str) – The name of the uploaded file. progress(float | None) – A value from 0.0 to 1.0 representing the progress of the upload. Properties# error # error: str | None = None An error message if the upload failed. file_name # file_name: str The name of the uploaded file. progress # progress: float | None = None A value from 0.0 to 1.0 representing the progress of the upload.