Issue with having more than one collections

[ashBabu]

Hi,
I would like to add more than one collections in _config.yaml. The following is what I did

collections:
  applications:
    output: true
  videos:
    output: true
    order:
      - xta_motion.md
      - xta_sim.md
      - pipe_concept.md
     
collections_dir: collections_xtent

In the collections_xtent directory, I have added two directories, _applications and _videos, and a few markdown files. Then I added applications.html and videos.html. These files are copied from the already provided portfolio.html, the only difference being the site.data....portfolio.... is replacted with site.data....applications.... or site.data....videos.....
I use jekyll-serve and run docker run -p 4000:4000 -v $(pwd):/site jekyll-serve under the directory containing the Gemfile.

The problem

The videos in my website have the markdown files of the applications.

The site is available video-slider branch

Any help would be appreciated
Thanks