How to access file uploaded via form/File in a list

New user.

I am building a custom page with a download link to a file that was uploaded using the File upload with a list.

part of the code in page.yaml
header.files:
name: versions
type: list
label: files and versions
fields:
.fileversion:
type: text
.external
type: text
.versionfile
type: file
name: versionfile
label: Version File
multiple: false
destination: 'assets'
accept:

• .pdf

Uploading here works fine

But: how do I get access to this data in the twig file?
I want to achieve something like:

<a href=/assets/VERSIONFILE.pdf>VERSIONFILE</a>

I have read the very good documentation how to build the form, but it does not mention anything about how to access the data after the form has been submitted. The only example is on an image, but a PDF clearly is not image.

Any suggestion, or link to a clear example?

tia
Michel