How can I change my background image in vertical arrangement?

HI. How can I change my background image in our game app? I know how but it seems that after changing the file(from the former image to a new one) it does not seem to work.

You use this block:

image

Explain why it doesn't work, show relevant blocks.

After trying, I now discovered that I cannot use jpg for the background image but jpeg works. Thank you

jpg and jpeg should both work. Maybe show the image that caused the problem for you.

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