Should we handle upper case in filename extensions?

**Is your feature request related to a problem? Please describe.**

Filenames with extensions in uppercase show `Not Supported` message. The dataset I was working with for reference:
- https://github.com/datameet/Municipal_Spatial_Data/tree/master/Bangalore

**Describe the solution you'd like**
The case of the extension should be handled properly.

**Additional context**
The file I uploaded to generate the error was called `features.GeoJSON`
```json
{
"type": "FeatureCollection",
"features": [

{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
77.42752075195312,
12.799749118050592
],
[
77.75985717773438,
12.799749118050592
],
[
77.75985717773438,
13.119604924382594
],
[
77.42752075195312,
13.119604924382594
],
[
77.42752075195312,
12.799749118050592
]
]
]
}
}
]
}
```