I see you found a solution fpr your self, just wanted to answer to your warining message:
system() has been disabled for security reasons
You or your host disabled the system function or even all execute function of php. This is done on a shared server to protect the server and clients in a better way.
Your workaround is nice. Images won't be stored and rendered everytime a user visits a post. This could be a problem on big boards...
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