Hi everyone.
For those needing to move Files from one Item to another and wanting to spare themselves the downloading/reuploading procedure, I’ve found a plugin originally developed by Gero Zahn / Githanjalli Elangovan: ReassignFiles.
As original developer cannot work on it any longer, I’ve forked and released it with his permission (all credits goes to original developer).
Release can be found at https://github.com/DBinaghi/plugin-ReassignFiles/releases