Modify custom fields in file uploads

[FrA1l3]

Hello friends.

I have been making the modification of adding 20 custom fields to my gallery for years, with each update I make the same modification and I explain it in this other thread:
https://coppermine-gallery.com/forum/index.php/topic,79437.msg390717.html

The thing is that there is a file that I am resisting, and it is the upload.php.
By default it shows the first 4 custom fields and I can't get it to show my other custom fields.
Could you help me please?
I am leaving you an image of the files so you can see how the other custom fields look in other places.

It would save me a lot of time if I could establish the custom fields before uploading the photos, since it is information that they share and I wouldn't have to add the information one by one

[FrA1l3]

A small clarification, when I choose the option to upload a single file, I can see all the fields. It is in the multiple files option where the custom fields that I need to fill out do not appear.

(https://i.imgur.com/ZIVGtFW.png)

thank you!