Serving 1 band GeoTIFF float32 file in Titiler/riotiler

I am very new to GIS and setting up COG servers.

The problem I am facing:

I am unable to serve my DEMs/DSMs, which are in GeoTIFF format, as .png map tiles (z/x/y.png) using a tiling server "TiTiler", which is based on riotiler.
However for normal RGB raster TIFFs, it works fine. I am not at all sure how to interpret DEM/DSM COGs to tiling server.
Titiler has an API endpoint which returns the GeoTIFF information and type. See this is the output when I feed in both RGB TIFF and my DEM:

DEM:

{
    "bounds": [88.42379642445006, 22.56651317616363, 88.44287051283406, 22.58178886547563],
    "band_metadata": [
        [1, {}]
    ],
    "band_descriptions": [
        [1, "band1"]
    ],
    "dtype": "float32",
    "colorinterp": ["gray"],
    "nodata_type": "Nodata"
}

RGB TIFF:

{
    "bounds": [88.42379642445006, 22.56651317616363, 88.44287045398606, 22.58178886547563],
    "band_metadata": [
        [1, {}],
        [2, {}],
        [3, {}],
        [4, {}]
    ],
    "band_descriptions": [
        [1, "band1"],
        [2, "band2"],
        [3, "band3"],
        [4, "band4"]
    ],
    "dtype": "uint8",
    "colorinterp": ["red", "green", "blue", "alpha"],
    "nodata_type": "Alpha"
}

Clearly the DEM file is a single band TIFF, and also float32 image file. Now the issue I am facing here is, Titiler (map tile server), is not able to generate PNG files based on float32 TIFF.

As of now I am really confused how to go about this. My only goal is to generate .png maptiles from my DEMs/DSMs, so that I can overlay them on Google Maps.