Chapters 493-499, 509-522, 527-531, 533, 536-538, 563-576, and 603-611 are all missing
Mangago won't look for &upload them. You's have to download the chapters, save them in individual zip files, upload them to a file sharing site, & mail the links to the mods.
Or you can just read it here: https://manganelo.com/manga/jojo_no_kimyou_na_bouken
Basically a fanboy's dream in a battle royale