Undelete doesn't find the files I just deleted

[two4two]

I use Linux Ubuntu I just deleted TWO video files by mistake. They are mp4 files that I created using Kdenlive software. I just accidentally deleted them using the delete feature of Linux -- not the "send to trash" feature. So I thought I'd use testdisk 6.14 undelete to get them back. Undelete does not find the files. It is a 1.5 TB WD Elements external HDD formated as whole disk NTFS. Is this normal for my scenario that testdisk doesn't find the files?

[cgrenier]

The NTFS disk may have to be unmounted first. If it still doesn't list your files, use PhotoRec on the "free" space.