The image being on a transparent background is the main rule for making a tube. So if you download an image that is already on a transparent background, you only need to follow these next steps

Now that we have a transparent background for the image, click on File, Export, and Picture Tube

You can leave the settings as they are, just change the file name to whatever you want

That’s it! You’ve just made a picture tube! To use it, just click on the Picture Tube icon, choose which tube you want to use and click wherever you want to put it!

Remember that you can make almost any image into a tube including pixels that you’ve drawn by hand. As long as the background is transparent, you can export it into a Picture Tube