One possible reason is that your story settings are not configured correctly. Go to the story settings and make sure that sharing from external posts is allowed. Also, some platforms have different rules for different types of content. So, if it's a particular type of post like a sponsored post or a restricted - access post, it may not be shareable to your story.
There could be several reasons for this. First, check if the post has sharing restrictions. Some posts are set not to be shared. Second, make sure your account has the proper permissions to share. If it's a platform - specific issue, try updating the app. Maybe it's a bug that has been fixed in the new version.
Yes, there might be. Check if you have the correct permissions for sharing on the app. If not, enable them. Also, restart your device. Sometimes, a simple restart can solve glitches that prevent sharing.
It could be that your account settings are restricting the sharing feature. Check your privacy and sharing settings to make sure everything is enabled correctly.
It could be that your account settings are preventing the sharing. Check your privacy and sharing settings to make sure they allow sharing to your story. Also, make sure the post you want to share is allowed for such sharing.