I'd expect the following command to respect ADDSUFFIX but it apparently does not. What have I missed...?
image rotate=270 here preservedate addsuffix=_Left
Regards, AB

I'd expect the following command to respect ADDSUFFIX but it apparently does not. What have I missed...?
image rotate=270 here preservedate addsuffix=_Left
Regards, AB

ADDSUFFIX/O: When resizing images, this parameter adds a suffix to the output filename appropriate to the new size of the image.
If the image is only being rotated then ADDSUFFIX doesn't do anything.
You can use this as a workaround:
image rotate=270 here preservedate as="{file|noext}_Left{file|ext}"
Thanks Leo. That does the trick.
I did read the help but did not conclude that there was no resizing. To me, 1024x768 is not the same as 768x1024 except in area.
Regards, AB
It should probably work with rotation either way. I filed a feature request to see what GPSoft think.