Yes, you can. Instagram allows you to share a preview of your IGTV video on your story. This can be a great way to promote your IGTV content and get more views.
Maybe there's a technical glitch. Sometimes the app has bugs that prevent posting. Try restarting your device or reinstalling the app to see if that fixes it.
No. There might be some restrictions. For example, the length of the preview shown on the story might be limited by Instagram's settings. Also, if your IGTV contains copyrighted material without proper authorization, you may not be able to share it on your story.
It could be that your account settings are not configured correctly. Check your privacy and sharing settings to make sure posting to stories from IGTV is allowed. Also, make sure you have the latest version of the app installed as older versions might have compatibility issues.
There could be a few reasons. Maybe your internet connection is unstable. Or it could be that Instagram is having temporary issues on their end. Try restarting the app or your device and see if that helps.