During scene publish, you can see the following option

“Enter download URL or Website URL where user can buy or download object”

If you want to see “Download” button under your model on ArtisGL.com simply put download URL when publishing. If you want to sell this model and already have webpage, where others can buy your model (like Turbosquid) then put corresponding URL when publishing

If your model is not free put pricing information, ArtisGL.com provides search option for paid models.

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