Isn't it possible to re-arrange episodes by changing the "upload" date on previous episodes? If episode 1 was uploaded 10/5/17 for example, 2 was 10/7/17, 3 was 10/9/17, and you wanted 3 to come in-between 1 and 2 (ie, you accidentally uploaded the wrong page or just want to add additional pages), you can change the date on 3 to be 10/6/17 and tapas magically updates the episode list. I believe I've done that before when I picked the wrong upload date and somehow, my page got inserted between past episodes.