Relay supports multiple solid and linear gradient fills.
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Blend modes for fill colors are also supported.

Limitations
- Partially Supported Figma Properties
- Images can only have one image fill, but can have additional fills of other types (e.g., gradients).
- For gradients, only linear is supported. Future releases will provide additional support for the remaining gradient types (radial, diamond, and angular).
- In the Figma plugin, there isn’t a way to specify that a parameter can accept multiple fills. If you want to parameterize a fill color, only solid colors are currently supported for parameters.