what does not a png file mean

not a png file means that the image was not originally a PNG file, but was manually modified into a PNG file; that means that the image was in other formats before, and you only need to change the image back to its previous extension. can be opened.

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not a png file means that the picture is not in PNG format , indicating that the picture was in another format before, and it can be opened by changing the picture back to its previous extension.

That is to say, this image was not originally a PNG file, but was manually modified into a PNG file. Solution:

Open this image in the drawing tool that comes with the system, and do not do any processing. , save directly as a PNG file.

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