CMS collection list sort order doesnt provide option to select video link

Hello everyone !

I have built a CMS slider using finsweet CMS filter.

The above image is the collection list in which one of the custom field is VIDEO LINK . There will be only one video in the slider which has to be the 1st slide. I tried to use sort order to make it the 1st slider but I am not getting option of VIDEO LINK when i open sort order as seen in the below screenshot.

How can I solve this ? Is there another way to do this ?

Here is my public share link: LINK
(how to access public share link)