Form: can't upload image (for signature)

[dolmen]

Attach (recommended) or Link to PDF file here:
https://www.ccsce78.fr/uploaded/insc-2023.pdf
(GitHub doesn't allow to upload)

Configuration:

• Web browser and its version: Firefox 117.0
• Operating system and its version: MaxOS
• PDF.js version: Firefox 117.0 built-in
• Is a browser extension: no

Steps to reproduce the problem:

1. Open the document
2. Click on "Image de la signature" at the bottom of first page. See input highlighted in red on screenshot below:

What is the expected behavior? (add screenshot)

I expect a dialog box to open to allow me to select my image file.

What went wrong? (add screenshot)

Nothing happens.

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

[calixteman]

The pdf contains the form in two formats: XFA and Acroform.
In the Acroform version, there is no callback behind the button Image de la signature and unfortunately we render the Acroform one.