sounds like roblox’s audio moderation system is causing issues. even if the audio is under 10 seconds, it might be getting flagged for copyright or content reasons, especially if it’s recognizable like a car seatbelt alarm. your friend’s audio might work because it’s less known or modified enough to pass the checks. roblox has gotten stricter with audio uploads, especially after the changes this year, so it’s hit or miss sometimes.
if you’re uploading new sound effects, try making small edits to the audio (pitch, speed, etc.) to help it pass. also, double-check the source of the audio to make sure it’s royalty-free or original. sucks to waste upload limits like that though. hopefully roblox improves the system soon.