To sum up why TikTokDer is worth turn to account? Yes, you can use the TikTok default built-in functions.
But pay attention to few remarks: Each downloaded video will have watermark which includes TikTok logo and creators' nickname.
You don't need to install anything.
How to find video link in TikTok app? I can download TitTok video by using TikTok application itself, isn't it? For sure, you can download and save videos with a function within TikTok application.
Description: Where can I find my video after being downloaded?