Why Do ssh and scp See Different File Systems

My ssh to a host “sees” one file system; my scp sees a different one. How can this be the case, and how can I fix it. e.g.

$ ssh me@otherpc 'ls -l /tmp/media-files.txt'
-rw-r--r-- 1 me me 194399 Apr 28  2022 /tmp/media-files.txt

$ scp me@otherpc:/tmp/media-files.txt /tmp/
scp: /tmp/media-files.txt: No such file or directory