In short: Yes, but please read.
Yes, you may upload this type of content to LabelGrid, but before you deliver you must make sure all your content is suitable to be delivered to your selected DSP's. For example: YouTube, Facebook/Instagram, TikTok and other UGC services do not allow the following types of audio: background noise, nature sounds with no music, spoken word, sound effects, audio books, etc.
What is User Generated Content (UGC)?
User-created content found on services such as TikTok, Snapchat, Instagram, Meta/ Facebook, YouTube. This may include some services that rely on audio finger-printing to identify content across the entire platform.