In Linearity Curve, you can add Unsplash images to your document directly from the Library Tab.
First, open the Tab and then select Unsplash. Then, tap on the image you want to insert into the document or drag and drop it onto the canvas.
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).