The attached zip contains our Wizgrids Dungeondraft custom asset pack "wg.dungeondraft_pack" that we use for our maps. For this map set we some colorable underwater assets, some new colorable chests and a grass edged path. Also included are the dungeondraft files for this map set (Undersea Temple and Elementalist's Crypt) as well as variations for those maps.
Our maps also make use of the free Krager's Shadow & Light pack which you can get at https://cartographyassets.com/assets/7713/kragers-shadow-light-pack/. Without that asset pack some of the shading will be missing when you open our maps in Dungeondraft.
To install custom assets first create a folder wherever you plan to store your custom assets. I put mine under "\Documents\Dungeondraft Custom Assets." Then put any custom asset packs (.dungeondraft_pack) you plan to use in that folder. After that, open up Dungeondraft and click on the Assets menu. From there you should be able to designate the assets folder by clicking Browse and navigating to the folder you created earlier ("\Documents\Dungeondraft Custom Assets"). Then it's just a matter of clicking the checkboxes for the asset packs you want to use and hitting Accept.
Thanks for your support!