How to upload the image of nodejs?

There is an app which consists of a pwa program, this program has to update its background on the basis of the images from the server. Have thrown some code and it seems it works. But noticed a bug. Photos can't fully begin to shift (the size is normal, but the normal part has to be the top, and the bottom is just grey background ) (with some probability) 5defc22c15de1005289290.jpeg
April 3rd 20 at 17:20
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