Better fill up your job experience as stated in your resume.

The reason those features are available is to allow head hunter, recruiters and HR to search through shit piles of data and filter the correct candidate for the job. If no data was filled means you have no chance to be found. Even overseas experience is a vital information. Your chances are increase by 2-3 folds by working/graduated overseas.

Do the update on both. The data that you enter on their website allows them to filter for correct candidates, then they will take your MS Word resume and forward it to the employer or colleague.

I uploaded the MS word and just basically copy and paste what I had in my resume into their database manually. Usually the functions that they are using is the period of employment, type of industry, skills (both software, management and whatever), and maybe project description.

Usually how to increase your chances? When you apply for a job you will realize there is a summary comparison of your skills and the job requirement(posted by the employer/HR/headhunter) that you applied. Using that, you basically alter your skills to meet those requirements on higher priority applications. Try this trick on the lower priority application to see your chances. Remember you cant apply for the same role twice.