Question 2d Spine Pro Problems

Hi good day,

I am new in unity as well as in 2d spine pro, First i would like to know if there are some difference in Game size if i use 2d spine .json file and when creating a images sprite sheets ? does 2d spine .json gives much lesser output of your images animation? regarding with the problem when i try to import the .json file from 2d spine to unity i am only getting those three files, atlas,images and the .json, the materials and skeletal map is not there i dont know where i went wrong, i just follow tutorials in youtube and they only drag those exported files from spine to unity just like in this video.


and this is my spine settings

 

I thought I read somewhere you have to rename the .atlas file to, in your case, lukas idle B.atlas.txt