What’s the difference between .ztl and .zpr files in ZBrush?

.ztl = ZTtool This saves just your sculpt (the ztool), including subtools. .zpr = ZProject This saves all all the ztools that are currently loaded, including undo history, document background color, spotlight images, etc. Which one to choose? For small file size, use .ztl. For saving your entire “workspace” and undo history, use .zpr.

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