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What should I do if an "Image size cannot be less than 6*6px" prompt appears?

The reason why this occurs is because the picture you uploaded is smaller than 6*6px.You should avoid small pictures because the smaller the picture, the little information it carries and the less impossible to identify the right fonts.So a picture which is larger than 100px is recommended.If you can not find a larger picture, you can enlarge the picture and upload it.