uploading an image (BLOB) to mysql

Because you are inserting it  wrong.

Look at this code.

PHP Code:

$products[] = [
    'product_name' => 'MySQL DATABASES',
    'price' => 15,
    'product_image' => file_get_contents("https://i.imgur.com/UYcHkKD.png" )
]; 


You assign the contents to the image not png.

What did you Try? What did you Get? What did you Expect?

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