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How we can upload excel file using admin assets.
Try adding the the following to your MY_fuel.php "xls":
// Specifies what filetype extensions can be included in the folders
$config['editable_asset_filetypes'] = array(
'images' => 'jpg|jpeg|jpe|gif|png|zip|svg',
'pdf' => 'pdf|zip',
'media' => 'mov|mp3|aiff|mpeg|zip',
'assets' => 'jpg|jpeg|jpe|png|gif|mov|mpeg|mp3|wav|aiff|pdf|css|zip|svg|xls|xlsx'