GZDoom demo files

In trying to record and play back demo files in GZDoom I have found the following can and cannot be done. First off I can use the -record and -playdemo commands in the MacOS Console with the following command strings:

/Applications/GZDoom.app/Contents/MacOS/gzdoom -iwad doom2 -skill 4 -warp 3 -record demo001

/Applications/GZDoom.app/Contents/MacOS/gzdoom -iwad doom2 -playdemo demo001

But these commands CANNOT be used in the in-game console command line. (Obviously substitute demo001 and doom2 for whatever demo file name and game wad name you wish.) Instead I get the error message "Unable to open the demo 'demo001.lmp' as if the file doesn't exist (but it most definitely does).

Oddly if you load one demo file this way you CAN then use playdemo command in the in-game command line to load another demo file (i.e. demo002).

So I am correct that -record and playdemo cannot be used for the in-game console command line (with the exception above)?

Is there no way to record or play a demo file from within GZDoom?

For opening a saved game file I have been attempting the following command line:

/Applications/GZDoom.app/Contents/MacOS/gzdoom -iwad doom2 -loadgame save17.zds

But no bueno. "Could not read savegame 'save17.zds'. I have checked to see this file is a legit Doom II saved game file in the appropriate directory. Changing the file name to another legit Doom II saved game file yields the same result. I want to be able to start recording a demo file from a specific saved game file.

What am I doing wrong here?