What are the image size restrictions for this booru? Both in regards to the maximum file size that can be uploaded, and the minimum and maximum image dimensions that can be uploaded. I've been having trouble uploading big files.

Lots of artists on tumblr upload huge ass comics in small segments, which works fine with the way that website is formatted, but here it feels stupid to upload 20 small images that only make sense when put together and could easily be lined up to be read comic style. So I figured I'd just mash the pictures together in one file so it's all in one place, but when I try to upload the file I made, the uploader tells me "An error occured. The image could not be added because it already exists or it is corrupted."

I've tried scaling down the image size with no dice, so I'm assuming I'm getting this error because the image height is too large, and I'd like to know exactly how long I can make these comic-style images.

I don't know. The largest comic I've managed to get on the booru was 4999 pixels tall, so you might try resizing it to that and seeing if it's still legible. Go ahead and post it, and put a link to the full sized comic in the "source" field.