3
Your proposed naming convention is useful for end-user, so it's wise to use it anyway. As for the system, there's no reason why it shouldn't be able to recognise file formats inside archive, it works on other marketplaces, so it should on cgtrader too. It's just a matter of will from cgtrader to implement it.
Of course, I use it - it is very convenient: always know what is it. It is not very time consuming to choose what is it during uploading process. But such features make this process easyer.
