So I uploaded a file into an upload field... and well, files get names that are not user friendly.

Is there a way to rename the file when the user downloads it? Like for instance give it the name of the record it's inserted in.

The file is renamed to the original name when downloaded. 

31 minutes ago, Adriano Faria said:

The file is renamed to the original name when downloaded. 

I'm manually inserting the download link in the template, like this:

<a href="{$record->customFieldDisplayByKey('file_field', 'raw')|raw}">Download</a>

But the file name is well... some numbers and letters, not just the original uploaded file name.