It would use your current level to calculate the amount of base file size with many other factor, This is calculated by Current Level if you have Compression Perk or else it would be File size multiplier of the file Random value between and Compression value through upgrade from Compression(Talent) and Modules attribute
The file size is purely determined by the Drivers version the version of THE GPU Driver or Network Driver for each
The version can be obtained literally, For example:
However, you have to kind in mind that on upload page, it display the next version so you should always minus 1 when you are checking for upload panel