'tags' problem

[BaGRoS]

II added a video from YT, and tags=['meditation','relaxation'], instead of tags on the page I only have #m and #r....
I tried tags='meditation,relaxation'
and tags=['meditation','relaxation'] both the same result.

[BaGRoS]

I found a solution, this should be a list with one string, with strings.
tags=['meditation,relaxation']