To answer your last question: yes, in the studio click on Project > Sample Upload > Upload Sample. I usually record on Audacity to avoid stutters, and when the entire sample is longer than 30 seconds, I cut it into smaller samples. But the trick is to zoom in to the maximum possible, so you can cut at a very precise fraction of bpm, and start the next sample piece from that very same value. Otherwise, the cut isn't clean and you'll hear some clicks when merging again the samples in the draft