Never mind! I found that there are instructions on using the app through itch to add custom blocks! Also, the greyed out icons are because the program is still in dev.
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I just bought the deluxe version for Mac. (It says 1.3 beta @ start.) It is not allowing me to import custom blocks via the collections folder. I'm using the provided test blocks from the guide.
Also, it looks like certain tabs are greyed out. (the one that looks like crossed arrows, the save icon etc. Is that normal?
I love this program otherwise!