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There could be a few reasons why the background image is not visible even though it is compiling in React's npm start:

Incorrect file path: Make sure that the file path to the image is correct and that the image is actually in that location. If the image is not in the correct location, it will not show up.
Incorrect file type: Make sure that the image file type is compatible with React. Common file types such as .png, .jpeg, and .svg should work.
CSS styling issues: Double-check that the CSS styling for the background image is correct. For example, it may be a z-index issue, or the image may be set to display:none.
Image size: If the image is too large, the browser might not be able to load it. Try compressing the image and see if that resolves the issue.
Cache issues: Try clearing your browser cache and refreshing the page. Cached files may be preventing the image from displaying correctly.