Numbering problem using Auto-numbering Wizard

(translation via Reverso.net)

Hello everyone,
Here I am again for an issue that I just realized, which I obviously didn’t have before.
When I want to reset my disc numbers or my title numbers, the 1/1; x/x no longer works. Is it due to a software update, a setting parameter of it or my PC configuration? I don’t know.
It’s really very annoying to rename my files as I want.
So, if someone has an idea... I thank them as usual in advance

In French (translation via Reverso.net)
Bonjour à tous,
Me voici à nouveau pour un problème que je viens de réaliser, que je n'avais manifestement pas avant.
Quand je veux réinitialiser mes numéros de disque ou mes numéros de titre, le 1/1; x/x ne fonctionne plus. Est-ce dû à une mise à jour logicielle, un paramètre de réglage de celle-ci ou ma configuration PC? Je ne sais pas.
C'est vraiment très gênant de renommer mes fichiers comme je veux.
Donc, si quelqu'un a une idée... Je les remercie comme d'habitude à l'avance

Do you want the TRACK content for your 19 selected tracks like this
1/19
2/19
3/19
...
19/19
or with a leading zero like
01/19
02/19
03/19
...
19/19

The screenshot shows that the numbering assistant does not know under which conditions a new disc starts.
You have to define this (either the folder or the contents of a field).
So either tick "Disque suivant au changement de repertoire" or the next option and select a field.

The files ... are they MP4 files?

LyricsLover:
Usually I use "03/10", but no matter, I can use "3/10". currently nothing changes, I stay at "1"; "2"; "3"

For the discs, I do not go through this editor, I edit through the left window, in 1/1; 1/2; 2/2, depending on my needs. The conversion editor is only used for song numbering.

I think you hit the nail on the head (French expression, maybe at your place too?). Indeed it’s not really MP4, but I’m thinking of an affiliated format, which I just discovered thanks to you: from . m4a

So, I understand that the problem comes from this format. No way to remedy it? Even other than through the editor? Afterwards, I must not have a lot of files in this format. At worst, I would do without them.

Thank you both.
I have to be away for a moment, so take your time if you have alternatives.

TRACK and DISCNUMBER are real integers - which do not allow anything but digits. So the / is invalid (and also leading zeros).
Check the extended tags dialogue Alt-T if there are now fields called TOTALTRACKS and/or TOTALDISCS.
At least for the file list you could emulate the display with
Value: %track%[/%totaltracks]
No alternative in the tag panel, though

According to the files in your screenshot these are all m4a files. As suggested above, this file type does not support the use of track or disc / total. You may have changed from using mp3 where this was possible.

Good evening,

I had to be absent a little longer than expected.

Thank you ohrenkino, I will test this. Well, that said, after doing a search, it turns out that I only have two albums in . m4a, so it’s really not a big deal...

Thank you all again.

Did you have a look at the extended tags dialogue Alt-T and did you find the total number of tracks there in a separate field?

Your player should show the data correctly.
You will not get leading zeros, though, due to the real integer number.