It might be that your Instagram app isn't updated to the latest version. Also, check if your account has any violations that prevent this action.
It could be that the person whose post you want to add has restricted the sharing option. Or, there might be a problem with your internet connection.
Maybe it's a technical glitch. Sometimes Instagram has these random issues that get fixed after a while.
Maybe there's a problem with your internet connection. Check if your Wi-Fi or mobile data is working properly.
Maybe there's a technical glitch or a setting that's preventing it. Check your app's settings and see if there are any restrictions.
Maybe it's against the platform's rules or there's a technical glitch. Check the app's settings and terms of use for more info.
It could be that your Instagram app is outdated. Update it and see if that fixes the issue. Also, make sure you have enough storage space on your device.
Maybe your internet connection is unstable. Try reconnecting to a better network and see if that works.
Maybe there's a problem with your internet connection. Check if it's stable and working properly.
Maybe it's against the platform's rules or privacy settings. Some social media platforms don't allow reposting others' posts without specific permissions.
Maybe there are privacy settings preventing it. Some posts might be set to not be shared by others.
Maybe it's a glitch in the app. Sometimes these things happen and it'll sort itself out after a while.
It could be that your internet connection is unstable. Poor connectivity can stop you from adding to your Insta story. Also, check if you have the latest version of the app installed; outdated versions might have bugs causing this problem.