Hi there! I imported the tank picture, added it to the image component, but it appears black, and the size is just 32 by 32 pixels… Any idea how to fix this> Thanks! 
Got it. In the version I’m using 4.13.1 you have to drag and drop the image directly into the brush slot, otherwise it prompts you to save the image…that’s weird…
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Thanks. This is still helpful in 4.17.2.
I think I know what’s going on here. If you single-click on the image dropdown under Brush, it will look for the actual image file, not the unreal image asset. If you select one that has already been imported, it will ask if you want to recreate that asset.
What you want to do is hold the mouse down over the dropdown and then search for the image asset you imported. This does the same thing as what Draghici_Stefan suggested, which is to drag and drop the image from the content browser.