Finding a VRChat Avatar ID (also known as a Blueprint ID) depends on whether you are looking for a public avatar or one of your own uploads. The Avatar ID is a unique string (e.g., avtr_26187637-0c30-4a09-86e1-bc928c07309e) used by VRChat to identify specific models in its database. Finding IDs for Public Avatars
Private by the uploader, or it is a Quest-only avatar while you are on PC (or vice versa). VRCX cannot fetch the ID of private avatars via API. You will need the log file method (Method 1) as you are technically loading the asset locally.