Publishing under the new system
1) Take a look at \Steam\SteamApps\common\Age2HD\resources and find out where the files that you have modded normally reside. For example, scenarios are in \_common\scenario
2) Go to \Age2HD\mods and create a new folder and name it what you want your mod to be called in the workshop.
3) You need to recreate the folder structure that you found in the resources folder. For example, to publish a scenario you would make these folders: \mods\YOUR_MOD_NAME\resources\_common\scenario\YOUR_SCENARIO.scx
4) Open the game and click on “Steam Workshop”. You should hopefully see an unpublished entry for your mod. You can publish it from here. If you don’t see an entry, you probably misnamed one of your folders.
5) You can edit the preview image by replacing \mods\YOUR_MOD_NAME\_preview-icon.jpg
Hope this helps! Please ask any questions you might have.
You can also look at this guide:http://steamcommunity.com/sharedfiles/filedetails/?id=567056287
or this video:https://www.youtube.com/watch?v=F0EfdBZm6O8
Updating under the new system
1) Subscribe to your item that you want to update
2) Make sure that title of your mod in the Workshop exactly matches the name of the folder that houses your mod.
(for this example, both should be called YOUR_MOD_NAME)
If this is not the case, change one of them to match the other.
2)Go to \mods\YOUR_MOD_NAME\ and make sure you have the new versions of your files in place
2)Start the game and click on “Steam Workshop”
3)You should see two entries for your mod:
-One will have the “update mod” option grayed out. This is the subscription. If you click on it, you can see the file names of the files currently included in the published version of your mod.
-The other will have “update mod” available and should list the new file names (if you changed the names).
-If you see a BLUE FEATHER and “publish mod” available, then you need to STOP
. Either: You are not subscribed to your mod. Exit the game and go do that.
Or: If the name of your mod folder does not exactly match the name of the item in the workshop you will also have a blue feather. In this case you need to rename either the folder or the entry in the Workshop so that they are identical. Only then can you proceed with updating it.
4)If everything is in order, click on “update mod”.
5)Clear the description field to prevent it from overriding your existing description in the workshop
This thread used to house information about bugs in the “old workshop” (pre-patch 4.0+); you can still find that information here:http://steamcommunity.com/workshop/discussions/-1/144512942757898940/?appid=221380
Most of the early posts here relate to the old workshop and are no longer relevant.