First off: I have enabled cloud saves. You now have 10GB of free space thanks to Valve. It should sync maps automatically between devices, even cross-platform!
But the bigger news is that I have enabled Steam Workshop support. It is incredibly easy to use: simply right-click the thumbnail for any map, token, or tile in the main menu. There is now an "Upload to Workshop" button. Click that and you are done.
By default, all items are public, the description is the tags you've given them (or blank as the case may be), and the title is the filename. You can go in and change all these attributes from within the Steam Workshop.
They are even tagged if they are animated (for maps and assets) or in the case of maps, if the map has wall data bundled. So you can filter results from within the workshop by those attributes. Pretty cool!
You can access the workshop from Steam the usual way, or to quickly get there from within the program just click the "Free Maps" button from the main menu. You'll notice the old set of 500+ maps are no longer bundled there.
It was a hard decision to remove the bundled maps but in the long term, I think it was the right call. I couldn't expand the selection quickly by taking the time to coordinate with artists directly to share content.
Now anyone can share anything in just 2 clicks. I hope that the library quickly grows to far exceed the 500 that used to be bundled.
I will be reaching out to those artist shortly to see what we can do about getting their content added to the workshop. If you want their maps in the meantime, here is a list of their websites where all of that content (and much more!) is available right now for free:
https://www.tomcartos.com/
https://www.reddit.com/user/uchideshi34/
https://snowysmaps.com/
https://www.dmsguild.com/en/browse?authorName=Tessa%20Morecroft
https://www.patreon.com/cw/zindanlar
https://www.milbysmaps.com/
https://www.patreon.com/cw/MapleMapsDnD
https://www.patreon.com/cw/CropoxBattlemaps
Lastly: I have paid ransom to Apple and am considered a "developer" with them now. So the Mac version is notarized and should no longer give people trouble with the babysitter not letting you use the hardware you bought.