How to upload audio files with express backend and react-native?

when I try to upload audio files in my react-native project, it seems no Filelist in react-native , so I can't upload file , any one could help? thx~

interface IAudioInputs {  readers_id: number;  level_type_id?: number;  books_id: number;  page_num_id: number;  recording_data: FileList | string  ;}