Editing Add-on units

[Overlord Byron]

I've been playing around with this game and its add-ons and I became interested in modifying unit data (specifically units found in the Ageless Era) to get a better grasp of how modding works. However, none of the modifications I make to unit files in the User/Documents/My Games/Wesnoth/Data/Add-ons/AgelessEra/units folder seem to be reflected during play. Is there something I'm missing?

And as it should go without saying, I do NOT intend to upload, publish, or use any of these alterations in multiplayer games. I'm just trying to get a good grasp on how modding works through experimenting with existing mods.

[Vazl]

It's been a while since I made content for Wesnoth, so I can't remember off the top of my head -- however, you should check out the introduction to content creation[wiki.wesnoth.org], and you might pick something up.

[Celtic Minstrel]

If you make changes while the game is running, you need to press F5 while at the title screen to refresh the data. Assuming you're only changing existing files that seems to me to be the most likely problem here?

[Overlord Byron]

I found the issue. I needed to edit ageless_4_19.preprocessed.cfg