That's because you're looking at a 6 year old thread.
You can no longer change the attachment path in Jira, it is always <jira home>/attachments.
You can still mount different directories there or use symbolic links to place it where-ever you want, but you have to do that with the operating system, not Jira.
After version 5.1 of Jira - for security reasons - the ability to change the attachment directory has been removed.
So now, the recommended way is to create a symbolic link from the default attachment path to the target path where you want your attachment to be uploaded.
Please check here for more details: https://confluence.atlassian.com/display/JIRAKB/Changing+The+Attachments+Directory+in+JIRA+4.2+to+JIRA+5.1
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