If you want your components to accept other mimetypes, add a key temporary_uploads_allowed_extensions in the media-library.php config file.
// in config/medialibrary.phpreturn [
// ...
'temporary_uploads_allowed_extensions' => [
// your extensions
... \Spatie\MediaLibraryPro\Support\DefaultAllowedExtensions::all(), // add this if you want to allow the default ones too
],
],