The geojson file is only 1.7 MB. I've had the same problem with all the other geojson files I've tried. I haven't successfully uploaded any geojson files.
If I look in Index Management, the index is present, but it doesn't come up as an option when I make a new map and try to add an index layer.
That file leeds_wards_extract_fix.geojson is working on my Kibana 7.6.1, you sure it's not being able to load it, have you tried to clean up your indexes and saved objects?
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