The issue of textures turning gray when "override for android" is checked, even if "read/write" is enabled, could be related to the handling of premultiplied alpha (PMA). When textures are exported with PMA, the RGB values are multiplied by the alpha value, which can cause unexpected visual results if not handled correctly in the rendering pipeline. It's important to ensure that the texture settings in your build environment, such as Unity, are configured to handle PMA correctly. This might involve disabling automatic PMA in the build settings or ensuring that the texture is not being premultiplied twice, especially for platforms like iOS or Android where such settings might be overridden.
