[Home](./index.md) > [@firebase/storage](./storage.md) > [UploadTaskSnapshot](./storage.uploadtasksnapshot.md) > [bytesTransferred](./storage.uploadtasksnapshot.bytestransferred.md) ## UploadTaskSnapshot.bytesTransferred property The number of bytes that have been successfully uploaded so far. Signature: ```typescript bytesTransferred: number; ```