It is a set phrase: behind the scenes. You can't use the singular in this phrase.
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Behind the scenes
17 มิถุนายน 2024
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Behind the scenes (plural) 😊
17 มิถุนายน 2024
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The correct phrase is "behind the scenes." Even if it's a short clip, "scenes" is the standard term used.
So, your caption should be:
"Behind the scenes"