Step 1: Go to your Profile by clicking your Profile icon (circle) in the main menu

or by clicking the "View Profile" button on the top of your Workspace

Step 2: Click on the content you want to add to a Gallery. The content will open in a modal. Click the "Collect" button.

Step 3: Choose the Gallery that you want to add the content to and click "Save." If you don't have a gallery, you can click the "Create new" button to create a Gallery and save your content to it.