1. Rasterize the layers
  2. Effects can also be switched off
  3. Background should be a single layer (convert to Smart Object → Rasterize the layer)
  4. Flatten the images
  5. Convert vector type to PNG (rectangle & circle are supported shapes)
  6. When an effect is not supported (Group the layers → convert to Smart Object → Rasterize the layer)
  7. Rename the layers
  8. Upload the font

Supported Formats → .jpeg, .jpg, .png Unsupported Formats → .webp, .ai, .tiff