Hi folks,
just a quick guide for myself in case I'll need later,
in order to use custom model checkpoints (from Civitai), you cannot simply add them in "ckpts" folder in wan2gp because they will not appear in web GUI,
you have to create finetunes definition files:
1) place Civitai downloaded models into existing "ckpts" folder
2) make note of their exact filenames
3) go into existing "defaults" folder and locate a .json file that's closest to your downloaded base model (for ex. for LTX-2.3 you can pick ltx2_22B.json)
4) copy that chosen .json file into existing "finetunes" folder
5) rename it to match your downloaded checkpoint model filename
6) edit the file (in text editor) to match your dowloaded checkpoint,
"name" to your liking, "URLs" and "Preload_URLs" to the full file name of the model including its filename extension, "architecture" is a group/category within wan2gp dropdown menu, so leave it as it is (assuming you picked most appropriate .json default file before)
7) optionally into "prompt" you can write some defaults to be automatically picked when loading the model in wan2gp
8) you will have to stop+start whole wan2gp for changes to take effect ;)