Hey! Is possible to import png spritesheet files to the editor and use newly loaded images?
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Hey there! Currently you can import only individual textures. I did this because in this way you can make sure to define your own unique IDs for every texture and you will not be conditioned by the randomizig IDs set in a spritesheet for each tile.
I decided to do it this way because it was the easiest to work with in the end product for me and maybe for other people too. At my end I import each object individually having unique IDs.
To be honest here, I had plans to think of a way to import .png spritesheets while also defining IDs for them, but I have a few other more important features in mind like duplicating chunks of map / exporting and importing them on other maps, automatic defining IDs for all the undefined textures in the assets folders and so on. But I will take your question into consideration and when I will have some time I will think about it:)
Thank you for your question and feel free to comment at any time:) I will reply
You gave me something to think about and I tried some things out.
I will show you a sneak peak ;)

I can promise that I am working on something and it will look like this;
You will be able to load a spritesheet, select a folder to save the textures, and then select the items you want from the spritesheet. The new name and ID will be defined automatically but a popup will let you modify them if you want to, if not just press "ok" or "continue". And then you will be refreshing the assets (I am working on this right now). And you should be ready to go in a few seconds.
But I have some other things in my agenda before this, so please stay tuned :D You will get this improvement in the near future, after 2 or 3 more updates before this.
Thank you for the suggestions and I hope you find my tool useful to you!