для этого нужно знать структуру хранения файлов на хостинге (пути), честно говоря сделать загрузку файлов на поддомен не простая задача, сомневаюсь что это можно сделать штатными средствами, можно написать скрипт который был загружал по ftp аватары на поддомен например. Но всёравно это не так просто сделать.
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