How can I deploy my project to serverless functions without "unable to match html templates" error?

I have my code setup so it finds external html file templates in the "external/html" directory using the LoadHtmlGlob function gin provides.

Instead of loading and serving the html content, it instead errors saying that the pattern provided can't find any files.

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// api/index.go
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func Handler(w http.ResponseWriter, req *http.Request) {
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  gin.SetMode(gin.ReleaseMode)
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  r := gin.Default()
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  r.Use(Cors())
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  r.LoadHtmlGlob("/external/html/*.html")
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  //***
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}

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//vercel.json
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{
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    "version": 2,
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    "routes": [
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      {
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        "src": "/(.*)",
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        "dest": "/api/index.go"
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      }
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    ]
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  }

Project structure: . ├── api │ └── index.go ├── external │ ├── html │ ├── models │ └── util │ ├── bucket.go │ ├── database.go │ └── redis.go ├── .env.local ├── .env.prod ├── .gitignore ├── go.mod └── go.sum