Hello Interloper!
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[0] 50 - 60 characters.
[0] 50 - 160 characters.
This is used for SEO listing and needs some sort of hook to make consumers click the link.
[0] 200 - 250 characters.
This is used for on the category listing pages.
Please select you thumbnail with the button below. You will then be able to drag the thumbnail around, zoom in and out until you have the cotrrect position in the highlighed box. Once you are happy click the upload button.