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 class-attribute instance-attribute # error: str | None = None An error message if the upload failed. file_name instance-attribute # file_name: str The name of the uploaded file. progress class-attribute instance-attribute # progress: float | None = None A value from 0.0 to 1.0 representing the progress of the upload.