Is this platform strictly for portfolio use or can we sell patterns there too?

Yes. Patterned is a portfolio and a licensing marketplace in one place.

• Show your work in a professional portfolio.
• License your patterns to brands, companies and individuals. Buyers choose a Personal, Commercial or Exclusive license at the prices you set.
• Work on custom deals. Invited brands can also ask you for custom terms, an adapted pattern, or a new commission. See What is custom licensing?

Every license is agreed and paid on Patterned, so you are paid safely and every agreement is on record.