Just want to confirm (because I don't know if I did something that causes the difference in behavior)...
Send To | Folder (Copy) | Copy Files to Folder...
The filename is prefixed with a sequencial number if the source is a playlist but if the source is a filter, the filename is unchanged (no sequential number). I don't see anything related to this when editing a playlist or filter but I'm guessing at why the behavior is different for the copy. Can someone confirm please?