If it had a transparent ... background from images. Fortunately, you don't need to spend even a single cent to accomplish ...

To make the background transparent in a PNG, your options include automated tools like Clipping Magic or the free Remove.bg ...

If you want to import some transparent images to your GIF animation, you can do so using the File > Open as Layers option. In case you have images with a solid background but you want to add them ...