You need to save your texture before you export.
Your texture also needs to be saved into your pack.
After you save the texture you need to load it by clicking your saved texture.
Hello, fellow community friends and family! Today I would like to share with you a Video I created to help you learn to use some of the many new features and tools in Cubik Studio
Creating a Template Resource Pack Video: iS7xeriOu80 (If you have not learned this it would be a more than great ...