Author Manga Edit Page: Attempting to upload a bad cover page results in a silent failure
If one attempts to edit a manga entry and uploads an image that exceeds the size limit (1 MB), the user does not receive and error and the UI does not change.

From the user's perspective, the "Saving..." dialogue will persist indefinitely with no changes being made.

Opening the dev console shows a '500 Internal Server Error', but normal users will not see this.
Yeah I asked this to be fixed a good while ago but eh