Hello,
first off I would like to say that this is the single best free map maker I have come across (and I have come across plenty).
I am a macOS user and everything was going smoothly until I wanted to add a custom asset (image = .png file) but nothing happened when I clicked the "import custom image" option. I realised it was probably the OS I was using so i jumped to a virtual machine and sure enough there it worked as intended, so I decided to export the .json file to finish the job on the host machine (because lets be real, a vm is way too clunky) but when I tried to import the .json file again when I clicked the "open/import map" option nothing happened. I tried getting around by maybe installing the desktop version and using wine to open a windows application on mac but to no avail. I really hope that there could be a fix for this because I finally found something that I could work with for map making.
Thank you