For a long time, anything you added to Aether was added to one campaign. Buy a map pack for your Thursday game and your Sunday game could not see it. That was the wrong shape, and this month it stopped being true.
Ownership sits with you
What you install is yours. It appears in your library, and from there you choose which tables get it. A pack you bought two years ago is available to a campaign you start tomorrow, without buying it again and without copying anything between worlds.
Tables stay deliberate
The other half matters just as much: a campaign only carries what you have given it. A horror one shot does not inherit every joke token you have ever collected, because a shared library that pushes everything everywhere is just clutter with extra steps.
Existing campaigns kept what they had
Nothing was moved out of a world you already play in. Content that was installed per campaign stayed exactly where it was, and now also appears in your library.
What this makes possible
Once content belongs to a person rather than to a world, a few things follow. Trying a pack in a scratch world before it touches your real campaign. Handing a co-GM a table without handing over your purchases. Starting a new game on Sunday night with the shelf you have spent two years building already behind you.
That last one is the whole point. The library is the part of Aether that should get better the longer you use it.
