アップローダーに以下3行を入れてください。
def size_range
1..10.megabytes
end
※ CarrierWave version 1.0.0.beta (2016-09-08) 以上の場合だけです
参考
https://github.com/carrierwaveuploader/carrierwave/wiki/How-to%3A-Validate-image-file-size
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