It might be due to a network issue. A poor internet connection can stop the music from being added. Try switching to a different Wi - Fi network or using your mobile data instead.
It could be that your IG account settings are not allowing it. Check your privacy and media settings to make sure music is enabled for your stories. Also, make sure you have the latest version of the app installed.
It could be that your IG version is outdated. Make sure you have the latest update installed. Also, check if your music library is properly synced with IG.
It could be that your IG version is outdated. Make sure you have the latest update installed. Also, check if your account settings allow for music integration in stories.
Maybe there was a glitch in the app or a compatibility issue with your device at that time.
It could be that the music you want to add isn't licensed for use in IG stories. Or, there might be some settings in your account that are preventing it. Try looking into your app settings.
Maybe there's a glitch in the app or your internet connection is unstable. Try restarting your device and the app to see if that helps.
It could be that your Instagram version is outdated. Check for updates and install the latest version. Also, make sure your music library permissions are enabled in the settings.
It could be that your device settings are preventing it. Check if your music permissions are enabled for Instagram. Also, make sure your Instagram app is up to date.
There might be copyright restrictions on the music you're trying to add. Instagram has certain rules regarding the use of copyrighted music. Try choosing from the available music options provided within the app instead.
Maybe there was a technical glitch with the IG app at that time. Sometimes updates or server issues could cause such problems.