Here's the map.

I encourage you to try it yourself. I've found that most maps export, but not this one. I made this map in the browser on a Mac, then tried to use the downloadable program on my Windows partition to convert the map into an image.

https://anonfiles.com/dezeZaF7o2/fine_png

No problems here. Maybe try downloading it from google drive. It might be the line endings.

I’ve found that maps with any dimension greater than 117 squares will not export.