android file upload speed?

Use the file upload from the dropbox api to create an Android app. But upload speed is only about 30 kb. Is there a way to speed it up?

try {
    InputStream inputStream = new FileInputStream(localFile);
    if(type == Define.DROPBOX_IDCARD){
        return mDbxClient.files().uploadBuilder("/id_card/" + remoteFileName)
                .withMode(WriteMode.OVERWRITE)
                .uploadAndFinish(inputStream);
    }else if(type == Define.DROPBOX_SECRET){
        return mDbxClient.files().uploadBuilder("/secret/" + remoteFileName)
                .withMode(WriteMode.OVERWRITE)
                .uploadAndFinish(inputStream);
    }

} catch (DbxException | IOException e) {
    mException = e;
}