I recently purchased Halo 5 and discovered there is no file browsing on the game. Now since the halo 3 forge I have loved downloading forged maps and playing them against friends. But now I am unable to do so. I hope 343 Industries will take this on board and add a feature to give people the benefits of downloading custom made maps. That’s all I ask. Thanks.
The file browser is Coming Soon™.
It’s not impossible to download maps, it’s just much more difficult than it used to be. You can only bookmark maps by adding players as friends, then you access their bookmarks by finding them in your Friends Roster in Halo 5. I’d start by finding maps that you want to try on YouTube, then add the map authors to get the maps. You can add The343Favorites to get all the maps that 343 has showcased in one place, including some of my minigames. Add me if you like minigames.
It’s been in a coming soon status for like 4 months now with no updates so take it for what it’s worth
Maybe it’s coming with the Memories of Reach update, along with every other basic feature of a Halo game that Reach had but 5 still lacks 
Thanks for all the responses guys, hope to see the feature soon(: