how to upload Shogun 2 mods

[Shirotora Kenshin]

Boooaahh! this sucks ! i made a mod for shogun 2 total war , now im try to upload this on steam,i use the shogun 2 mod manager,doubleclick on the mod i want to upload,give it a name
and write a description,then i click on add to steam workshop,then i see the following sentence:

you are not allowed to add a new mod without a workshop image.

what i am doing wrong?someone can help?

[bonk]

For Rome you have to add a jpg picture file in not sure if its the same for shogun

[The_Yogi]

Yep, you got to make a .jpg image in the exact same name with the mod in the game data folder.

[Gaius Julius Caesar]

How do you access the mod manager for Shogun II though? When I open Shogun II by clicking play in my games library I just get a "Play shogun II, Encyclopaedia, Benchmark game settings" list come up and no option for mod manager.