I can't figure out why slides don't work

A home owner from Knoxville, TN says:
Drawer Slide is about 14 3/4" long and 3/4" wide. Dresser slide is about 15 1/2" long and 1 1/2" wide.

The track doesn't have anything to keep dresser and drawer on track.
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Bob from SWISCO responded:

If it lacks drawer sockets and guides, nylon pieces usually at either end, this might be why the track doesn't work. However, the tracks also may be too worn to run properly. Looks like you have a centered undermount track, so I recommend seeing if you can replace this setup with our 32-053 kit, which comes with all the parts you'd need. The video below shows how to install it. See what you think.

How to install a drawer track kit
How to install a drawer track kit
VIDEO
WATCH >
Installing the 32-053 Drawer Track Kit
Installing the 32-053 Drawer Track Kit
VIDEO
WATCH >
Kenlin drawer replacements and adaptations
Kenlin drawer replacements and adaptations
GUIDE
READ >
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