Hi Ryan,
Please share me a sample plotter file and also the name of the plugin you are using to add the mime type. I will test it and will get back to you with more details.

Regards
Brajesh

Hi Ryan,
Thank you for sharing the issue.

The problem was the file extension plugin enabled the file type for the upload but did not add it to the list of known mime types.

so, upload was working but the file was not selectable.

Please add the following code extra(Keep the file type plugin active).

/**
 * Extend list of all mime types with plottr
 */
add_filter( 'mime_types', function ( $types ) {
	$types['pltr'] = 'text/plain';

	return $types;
} );

to your bp-custom.php and try now.

regards
Brajesh

Hi Ryan,
Thank you for the kind words. I am glad I was able to assist.

Regards
Brajesh