How to upload a house on PlatinumSimmers

Make sure you are logged into the site, then press the Downloads button at the top of the page.
You will get this window:

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Press Upload File at the right/top

Then choose the Sims 3 > Lots > houses category

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Upload the sims3pack, pictures and fill in the text.

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If you are entering the competition make sure to use the tag "greenhouse" or let us know in the Description that its an entry.
When you are done press 'add submission'.