Migration from Sync API v1 to Core API v2

Hi

I am facing another issue while uploading a file on Dropbox. I have written code below for uploading a file.

InputStream inputStream = null;
FileMetadata obj = null;
try {
    inputStream = new FileInputStream(srcFile);
    obj = mDbxClient.files().uploadBuilder(remoteFolderPath + "/" + remoteFileName)
            .withMode(WriteMode.OVERWRITE)
            .uploadAndFinish(inputStream);
} catch (DbxException | IOException e) {
    obj = null;
    mException = e;
} finally {
    if (inputStream != null)
        try {
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
}

This code returns a NetworkIOException when Internet is off. While uploading a file with Internet off, Sync API v1 never threw any exception. When Internet was turned on, it automatically uploaded the file. Can I have such behaviour with Core API v2 also? How can I implement this?