Hi @matteo,
There’s no way to change the original file name stored in file metadata. You can specify a name on download when it comes to single files.
When you download a group as an archive, you can also specify the output file name for the archive file by adding a name to the URL after the last slash. For example,
https://ucarecdn.com/088de3b6-c5f2-4f56-9e9c-87b0b960286e~3/archive/zip/myarchive.zip
But in the archive, individual files will have their original names.