How to allow .ged file uploads

you need to allow them to be uploaded in your media files.

you can add following code to your themes functions.php and it should work.

function my_mime_types($mime_types){
    $mime_types['ged'] = 'application/octet-stream';
    return $mime_types;
}
add_filter('upload_mimes', 'my_mime_types', 1, 1);

there is more information about adding new mime types in WP here: https://wpsmackdown.com/add-remove-filetypes-wordpress-media-library/#add-filetypes

Here is an info about the .ged File MIME Type: https://whatis.techtarget.com/fileformat/GED-Genealogical-data-GEDCOM

And here a list of the mime_types: https://feedforall.com/mime-types.htm