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DAZ|Studio F.A.Q (Updated: 2019 Feb 01 1:12 pm)
Subject: Substance Painter & Daz Studio
I use Document channels + Normal + AO (with Alpha), Dilation + Transparent (32 pixels of dilation for a 4096x4096 map, less for smaller maps) Then I exports as png 16-bit, but you could choose jpeg if you want to go straight to DS. (I go through GIMP to save for a particular file size v. quality and to combine the separate surfaces that may be on one map).
This will output all the maps, but some may be blank (like a metallic map for a non-metallic surface). Also make sure you're using OpenGL for the Normal format. The output will include the non-openGL map too (I don't know why) but you need to use the OpenGL one.
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@Biscuits DzFire on the Daz forums actually posted an export preset for Iray usage. Link still works. https://www.daz3d.com/forums/discussion/comment/915815/#Comment_915815
There's also a post on the Allegorithmic forums by Szark regarding maps for studio. https://forum.allegorithmic.com/index.php?topic=13211.0#msg57736
Pixels + Polygons = <3