After downloading a sample, a purple Syncing button will appear on the bottom-right of the app. Once syncing is complete (this should take a less than 2 seconds), you'll see a Drag button. Use that to drag and drop the modified version of the sample to your DAW.
The drop-down arrow allows you to choose whether you want to use the Modified version (time-stretched / pitch-shifted) or the Original sample (non-modified version). The modified version is the default choice.