finder – how can I fix problem with Preview refusing to delete files on external drive?

I find that I generally cannot remove files on my main (hfs) external drive via Preview. I can remove them via a Finder window, and I can remove then from Terminal .. just not Preview!

If they’re on my main drive (the internal SSD on my Mac Mini), I can remove them via Preview without any problem.

Here’s the directories (and security flags) for one file in question (foo.jpg):

  ls -l -d / /Volumes/ss /Volumes/ss/pics /Volumes/ss/pics/misc

  drwxr-xr-x  20 root    wheel   640 Oct 12  2022 /
  drwxrwxr-x+ 97 root    wheel  3366 Jul 26 22:49 /Volumes/ss
  drwxrwxr-x  33 sieler  staff  1122 Jul 27 21:17 /Volumes/ss/pics
  drwxrwxr-x  13 sieler  staff   442 Jul 27 21:24 /Volumes/ss/pics/misc
  -rw-r--r--  1  sieler  staff  3035137 Jul 19 12:40 foo.jpg

Attempts to remove via Previe (e.g., right-click, select ‘Move to Trash’; or left click and hit command-backspace) get a popup:

  You do not have permission to
  move the file "foo.jpg" to the trash.

What’s wrong with Preview? (And, can I fix it?)

My external drive is: Mac OS Extended (Journaled) I’m on Monterey (12.6.1)

Update: Oddly, Preview will let me rotate them and save them back in place, which effectively removes (and recreates) them, so it HAS access!
And, since I can Finder-remove, or Terminal/rm-remove, I clearly have the rights to remove the file (and to access the .Trash folder).
(Yes, the vast majority of other files on the drive are Preview removable.)

thanks!