Sometimes, it might be because the platform is undergoing maintenance or has reached its upload capacity for the moment. Just wait a while and try again later.
It might also be that your internet connection is unstable. A weak connection can cause upload failures. Make sure you have a strong and reliable network.
It could be that your account doesn't have the necessary permissions. Or, the platform might be undergoing maintenance. Wait for a while and try again later.
It could be due to several reasons. Maybe your file format is not supported, or your internet connection is unstable. Also, check if you have the necessary permissions or if there are any size limits for the uploads.