There could be several reasons. Maybe your internet connection is weak. Check if you have a stable Wi - Fi or good mobile data. Also, it might be due to a problem with the app itself. Try closing and reopening the IG app. Another possibility is that your story violates IG's community guidelines in some way.
First, check your network connection. If it's not stable, switch to a better Wi - Fi or mobile data. Then, restart your Instagram app. This simple step can often solve the problem.
There might be some copyright or content-related issues that are holding up the upload. Or, it's possible that the person trying to upload hasn't followed the correct procedures.
It could be that the author or the person responsible for the upload hasn't completed the necessary preparations or is facing some unforeseen delays. Sometimes, there might be edits or final checks that need to be done before it can be uploaded.
It could be due to a poor internet connection. Make sure you have a stable network. Also, check if the website or platform is experiencing any server issues.
Maybe there's a technical glitch or a problem with the upload platform. Check your internet connection and the file format to see if they meet the requirements.