How can I maintain zeroes in filename track numbers

I’m adding ID3s to existing files, where the track numbering has leading zeroes (I’m talking about folders which can contain thousands of tracks) but when using a standard copying format of %track%. %artist% - %title% I’m find that any leading zeroes in %track% are omitted.

How can i configure MP3tag to copy in the way that i need ??

Happy Christmas

Instead use:
$num(%track%,4). %artist% - %title%
where the 4 represents the number of digits that each track number should have, padded with zeros, if required.

Many thanx for that solution.