How to download files from mobile web?

I made the ability to download files. The code works well on PC web browsers but not on mobile web browsers. I would appreciate it if you know how it works on mobile.

            const filePath = findFile[0].path;
            const fileName = findFile[0].filename;
            const mimetype = mime.getType(filePath);
            // 헤더 세팅
            res.setHeader('fileName', encodeURIComponent(fileName));
            res.setHeader('Content-type', mimetype);
            res.setHeader('Content-Disposition', 'attachment; filename=' + encodeURIComponent(fileName));
            // aws s3 파일
            const params = { Bucket: 'flag-kog', Key: `${username}/${fileName}` };
            s3.getObject(params)
                .createReadStream()
                .pipe(res);

    componentDidMount() {
        const { username, flagname } = this.props.match.params;
        axios({
            url: `/api/files/download/${username}/${flagname}`,
            method: 'GET',
            responseType: 'blob',
        })
            .then(res => {
                const filename = decodeURIComponent(res.headers.filename);
                this.setState({
                    filename,
                });
                // 다운로드
                const url = window.URL.createObjectURL(new Blob([res.data]));
                const link = document.createElement('a');
                link.href = url;
                link.setAttribute('download', filename);
                document.body.appendChild(link);
                link.click();
                this.setState({
                    downloading: true,
                });
            })
            .catch(() =>
                this.setState({
                    err: true,
                })
            );
    }