# Auto-numbering wizard fails on M4A

**URL:** <https://community.mp3tag.de/t/auto-numbering-wizard-fails-on-m4a/44608>\
**Category:** Support\
**Created:** [February 21, 2019, 12:31am UTC](https://community.mp3tag.de/t/auto-numbering-wizard-fails-on-m4a/44608 "2019-02-21T00:31:01Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dilburt](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/d/ac91a4/32.png) [@dilburt](https://community.mp3tag.de/u/dilburt)\
**Post date:** [February 21, 2019, 12:31am UTC](https://community.mp3tag.de/t/auto-numbering-wizard-fails-on-m4a/44608/1 "2019-02-21T00:31:01Z")

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1. Open a file containing MP4 tracks with M4A extensions (MP3Tag Ver 2.93).
2. Start with track numbers containing no leading zeros and select all files.
3. Select the Auto-numbering wizard and check the option to provide leading zeros.
4. Click Ok.

Observe there are no changes to the track numbers.

1. Check the option to save total count of tracks
2. Click Ok.

Observe there are no changes to the track numbers

Dean

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**Author:** ![ryerman](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ryerman/32/5285_2.png) [@ryerman](https://community.mp3tag.de/u/ryerman)\
**Post date:** [February 21, 2019, 3:18am UTC](https://community.mp3tag.de/t/auto-numbering-wizard-fails-on-m4a/44608/2 "2019-02-21T03:18:56Z")

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That is not a bug.  
For an explanation, search the forum: M4A leading zero

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**Author:** ![system](https://community.mp3tag.de/uploads/default/original/2X/c/ce7035d426cb755a7916793326d23b465222a407.png) [@system](https://community.mp3tag.de/u/system)\
**Post date:** [March 23, 2019, 3:18am UTC](https://community.mp3tag.de/t/auto-numbering-wizard-fails-on-m4a/44608/3 "2019-03-23T03:18:58Z")

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