Importing drawings

Hi, I’m a complete newbie to 2D animation. This may seem like an obvious question, but I can’t find the answer in any of the FAQs or tutorials. I want to import my own handmade drawings into Pencil2D to use as an animation. I’ve drawn the first and last keyframes, and all the drawings in between, so I just want to create a sequence importing all my drawings from the first keyframe to the last keyframe, and all the inbetween frames. Any advice much appreciated.