How can i create new livery file in ytd

Hi, I was trying to make new liveries to Evo 9 but after uploading it to my test server I couldn’t be able to see my liveries. I tried to name it vehicles_sign_1 or evo9_sign_1 but it was not seeing my liveries. There was no template, sign or livery file in ytd file. Can someone help me how to create one?