I’m pretty sure you have to import a texture along with a mesh to get color in roblox studio.
Here are some articles on the same topic:
https://devforum.roblox.com/t/help-mesh-colors-not-showing/608667
https://devforum.roblox.com/t/color-not-showing-in-roblox-studio/1323997
You can also look it up, there are tons of resources to help you!
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