I know I've probably missed the usefulness window, but I found a way to find the uuid of my Slink, Tone 5 body. I used the free app Lightshot. I Pressed PrintScreen, then cut out a square of my skin. I then saved the file as Skin Match. In FireStorm, I used the Build menu's Upload feature (way down the menu) and upploaded the image...which was then saved as a texture. I opened the file in FireStorm and low and behold there was a UUID button to auto copy the UUID to the Paste option. In my Catwa Skin section, I selected ApplyMy Own Texture. In the popup box, I "Pasted" that beautiful UUID and selected Accept.
The results are beautiful! There's no seam line anymore. There's nothing to distinguish the head from the body now. Amen to that!!💖💕😊
Even if you don't use FireStorm, it'd be worth logging into it once for this purpose alone. I'm ecstatically thrilled right now! I hope you get the same feeling. You and any others who seek out this solution, and find an answer! God bless you!