do not remove everything in 'safe' each time I add a new file

When uploading CVs, we are not going to upload them all at once to nextcloud. It would be great if the files that were already processed, do not get removed when I add a new file to process (unless they have the same name).

I uploaded CVs 1 to 12 and they were processed and we were able to read them in 'safe' folder. But when I added the 13th file then the first 12 files got removed and I only found the 13th in the safe folder.