When inserting media into the running MSX, only the filename is stored and not the sha1sum of the file. When replaying the file, the command is simply ignored if the path is not found...
This makes the whole portability feature of OMR files useless for media which are inserted with commands (so not at startup time).
Moreover, you don't get any warning or error when the recorded command fails at replay time.
Attached an example from mth.