Method upload

forms/multipart-s3/src/client.rs:74–81

(&self, file: &TempFile, key_prefix: &str)

    }

    async fn upload(&self, file: &TempFile, key_prefix: &str) -> UploadedFile {
        let filename = file.file_name.as_deref().expect("TODO");
        let key = format!("{key_prefix}{filename}");
        let s3_url = self
            .put_object_from_file(file.file.path().to_str().unwrap(), &key)
            .await;
        UploadedFile::new(filename, key, s3_url)
    }

    async fn put_object_from_file(&self, local_path: &str, key: &str) -> String {
        let mut file = fs::File::open(local_path).await.unwrap();