How Do I Increase upload_max_filesize on Sub-Domain

I have increased my upload_max_filesize to 256MB (verified when I check mysite/php.ini), however on my store.christiangays.com site, when I try to upload a 3MB .mp3 file I am told that my limit is 1MB.

Where do I change my max upload file size on my sub-domain please.

Thank you.
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