Thanks for the quick answer !
I am not sure if it answers the main issue which not how to upload files, but how to extract the filename that is being uploaded
For example, my pdf filename is PDF1234.pdf, when I upload it, it appears on my table, and I would see its filenames next to it.
To do that, I need to be able to extract the filename of the file I’m uploading, indeed with the widget I saw on the documentation, which I am already using.
I saw this issue which is pretty similar : Access original filename when uploading files with file picker widget
Maybe I missed something ?