If sharing is enabled by the portal creator, you'll see a share icon when you hover on assets in the portal. One asset at a time can be shared.

Share assets by clicking the Share icon.

Choose the kind of link you want to share from the dropdown, then choose how you want to share. Copy to share the asset via a link, use an embed code, or use the direct link, which is the URL in the embed code.

You may need to indicate your intended use or agree to the site's policy and terms before sharing.