Launching STL Emboss tomorrow — I'd be grateful for your early feedback

Hey everyone! I'm launching STL Emboss on Product Hunt tomorrow — it's a free, client-side web tool to emboss text, graphics, and tactile Braille onto 3D models without opening heavy CAD software.
Before tomorrow's launch, I'd really love your fresh eyes: what feels intuitive, what breaks, and what should I improve next?
Free, no sign-up, your files stay on your device: https://stlemboss.com