This could be due to a bug. Try relogging into the game first. Sometimes a simple relog can fix glitches that prevent you from progressing in the story.
Sometimes, blocked story paths in Kingdom Hearts can be due to not having unlocked specific abilities or having made wrong choices earlier in the game. Review your progress and look for clues.
It might be a problem with your character's level. Maybe you need to gain more experience and level up to continue the story. Try doing some grinding in the areas you've already unlocked to increase your level. Also, check if there are any skills or abilities that you haven't unlocked yet but are required for the next part of the story.
In Guild Wars 2, if you can't replay a story, it might be due to a bug. First, try restarting the game. Sometimes a simple restart can fix glitches. Also, check for any game updates. If the game is not up - to - date, it could cause issues with story replayability.
First, check your internet connection. A poor connection can stop the story from loading. If it's okay, then try logging out and logging back into Snapchat.