1.23 tops out at 1024
1.24 tops out at 4096

And for your tileset, width must be 320, height must be a multiple of 32, pallet must be 256 colors; if you have a masks file, it must follow all the rules and also be the same size as your original file; JCS also only recognizes very few filetypes, bmp and pxc being the only ones that I can think of off the top of my head.

If it isn't any of that, upload the full, uncompressed image somewhere or pm me and I'll give you my email so I can upload it.

`n0