In Linearity Curve, you can add Unsplash images to your document directly from the Library Tab.
To import images to your document directly from Unsplash, open the Library Tab, and then open the Unsplash Tab by clicking on the icon at the bottom.
Then, type a keyword into the Search Bar (1).
Once you've typed your keyword, press ↵ to show the results. Now you can scroll down through your results and tap on an image (2) to immediately import it onto your Artboard. Then you can select and drag the imported image onto a specific place on your canvas (3).