Profile of demiurbex

So I'm trying to add a fairly simple mod, American Commanders Expanded, to include more options for American(and later British) commanders. Basically I want to see specific factions for other countries, so a Free French commander under the AEF, as they used mostly American equipment. And later on doing specific Commonwealth countries for the British, such as Canada, Australia, and even the Polish brigades. I also want to broaden some of the strategic options that you see for other nations like Germany and the Soviets, so a Rangers company, Air Supremacy company, a Tank Destroyer company, a Last Line of Defense company (such as the holdouts at Bastogne) and so on.

I've set my attrib file to D:\Documents\My Games\Company of Heroes 2\modprojects\ACX\attrib.html.

Game Path: D:\SteamLibrary\steamapps\common\Company of Heroes 2
Tools Path: D:\SteamLibrary\steamapps\common\Company of Heroes 2 Tools
Java: D:\Program Files (x86)\Java
Flex SDK: D:\Program Files (x86)\Flex

I open the attrib file, clone the AEF, and go into the Commander abilities and make my changes. I then Build the mod, which gives me a ACX.sga file in D:\Documents\My Games\Company of Heroes 2\mods\tuning

However once I have the .sga file, when I go into the Modding Hub to find 'Unpublished' mods it sees nothing, nor does it see the Mod if I try a custom game and try to select it as a tuning pack. I've tried moving the .sga to /subscriptions.

Any ideas what I might be doing wrong? Any help is appreciated! Love CoH2, but want to see a bit more variety for my favorite factions.