For example, http://xtools.wmflabs.org/ec/en.wikipedia.org/JarrahTree shows 0 uploads on Commons.
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It was looking for the same user ID as the main project, so in some cases was showing *something* but in lots there was no match. Fixed now, see https://github.com/x-tools/xtools-rebirth/compare/29b94da87ceb444d24708e153276b9694fa578c4...6e7546d4c6cf02ea57f3cb7867ffbb7b3077efc8 for code.