I also use Autopano Pro and sadly Kolor/Autopano has closed down the business in September 2018.
http://360rumors.com/2018/09/kolor-makers-vr-software-autopano-panotour-closing-doors.html
I downloaded the last update they did and it is still working well on Mac Mojave and I'll need to check...
As long as you reduce the height and width proportionality, you won't change the crop. Here are the original dimensions and size.
Here is the result of changing Long Edge.
One way to do this in Luminar 3 is when you export, select Long Edge in Resize. And reduce the value a little at a time...
What software do you have access to for editing? Photoshop, Lightroom, CaptureOne, Luminar?
Depending on the software you can change the output size in MB by scaling it down or reducing the dimensions proportionally, or changing the quality level.
I’ve found their support very helpful for these kinds of questions. Here’s the Autopilot support page, in case you are interested in giving that a shot.
Autopilot – Hangar
Good to get as clear as we can on this.
I have asked the FAA the same question regarding Sectionals/airspace vs Facilities Maps.
I thought this was interesting.
This is from the FAA website on Facility Maps FAQ and the purpose of the Facilities Maps.
Unmanned Aircraft Systems (UAS) Facility...