Place it near the end of an edit, after the favour or gift is shown, so the thanks closes the moment. Start with an Oh My God Wow reaction for the surprise, then let this clip answer it, and finish with Kids Cheering when the group celebrates together.
About this sound
This 15-second voice clip speaks the Thai phrase khob khun kha, the courteous form a woman uses to say thank you. The warm, gentle delivery makes the gratitude feel sincere and sweet rather than stiff, fitting a kind favour, a gift, a compliment or a helpful reply. It carries the familiar Thai wording heard in everyday polite conversation, so listeners recognise the thanks at once even without a translation.