Raw Image support is under discussion to be removed. Please voice your opinion here if you believe Kavita should keep it.
Raw Images (Manga/Comic) library types are supported as loose leaf images within a folder. It is advisable to put a second folder named Volume 1 (and chapters if needed) so that the files are grouped as one volume, otherwise they will all be separate specials.
└── Manga 2 └── Vol1 └── Ch1 - Ch3 ├── Image 1.jpg ├── Image 2.jpg └── Image 3.jpg