Question above.
If you’re trying to find your File Share on the web, reference this piece of the 12.12 Halo Bulletin:
Search for in-game File Share is still offline. Custom searches (by tag, most recommended, and most downloaded) are not enabled and will return “no files found”. We utilized something new for this particular Halo 4 feature, and it’s taking us longer than we initially anticipated getting it to a fully functional state. We recognize this is not an optimal situation, and we’ll continue working on it until it reaches shipping quality. In the meantime, here are the different actions you can take in your in-game Halo 4 File Share:
• Upload files
• Download files
• Add to File Share
• Remove from File Share
• View someone else’s File Share (by Gamertag)
• Tag Files
• Recommend Files
• Receive File recommendations
This issue also affects web availability of the Halo 4 File Share. We expect both Search and web access to come online in early 2013, and we’ll provide another update in January. Again, we apologize for the delay, and we know this is painful for many of you. We’ll be brainstorming ways to celebrate both features’ release (contests, activities, etc.), so let us know via our forums if you have any ideas in that regard.