Sometimes when you import a post we'll get a generic "the link to this photo or video may be broken" screenshot back from Instagram:
This is usually where:
The post or account is set to private, so it can't be viewed unless you follow the account.
The account owner has disabled embed links outside of Instagram, so it's not possible to embed outside that platform.
The content is age restricted - alcohol, tobacco, adult content etc. Instagram looks at a logged in users profile to automatically determine if they're old enough. But our screenshots don't use a login, so the content has to be publicly viewable.
If you still want to include the clip you can take a manual screenshot and add it as an additional image to the clip.