# Not possible to save track numbers with leading zero in m4a

**URL:** https://community.mp3tag.de/t/not-possible-to-save-track-numbers-with-leading-zero-in-m4a/49664
**Category:** Support
**Created:** [July 19, 2020, 6:03pm UTC](https://community.mp3tag.de/t/not-possible-to-save-track-numbers-with-leading-zero-in-m4a/49664 "2020-07-19T18:03:56Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [July 19, 2020, 6:05pm UTC](https://community.mp3tag.de/t/not-possible-to-save-track-numbers-with-leading-zero-in-m4a/49664/2 "2020-07-19T18:05:44Z")

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> [@adkurz](#):
>
> Is there the possibility to fix this?

Not really.  
The mp4 tags do not allow leading zeros as the track number is really a number and not a "numeric string" as for mp3 files.

If you want to adapt the display in MP3tag, you could try  
`$num(%track%,2)`for the setting in "Value" for the column definition.  
(This will not show the number total tracks, though).

See also here:

> [@\[X\] Auto-numbering with leading zero fails](https://community.mp3tag.de/t/x-auto-numbering-with-leading-zero-fails/13064/):
>
> Hi Developers, I just installed v2.49b. There's a problem with auto-number tagging. Here's how to reproduce Choose more than 10 files Select the Auto-number wizard (Ctrl+K) Check the "leading zeros for tracknumbers..." checkbox Apply and save the files Refresh and see that leading zeros are not applied for track numbers 1-9 Thanks

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