I'm attempting to add a cover to the image as the first page, but it's giving me a lot of trouble. The files in the archive are 000.jpeg, 001.jpeg, etc. Trying to place a cover in the archive as 00000000_cover.jpg as the first page doesn't work. Unfortunately, the sorting doesn't appear to be sane, making it impossible for me to include the cover image prefixed by a 0 before the 000.jpeg file. Here's how the sorting sorts several of my attempts:

'_cover.jpeg', '000.jpeg', '0.jpeg', '00.jpeg', '0000.jpeg', '000_.jpeg', '000000000_cover.jpeg', '000_cover.jpeg', '000-cover.jpeg'

For some reason, '000.jpeg' always comes before other items that begin with 0.