The categorisation in development is on me. I moved it there since it was originally in showcase which is more for artwork and development seemed to fit well enough.
This is a limitation specifically with export, not the program as a whole:
Also keep in mind that, at least as far as Pencil2D is concerned, it is primarily an animation software and not a video editor, and if you run into limitations regarding the size of your project, it might also be a good idea to split it into multiple files: