Use ALT/Option key + click and drag to duplicate object in stack.
As an Adobe Xd user that uses many stack groups, I would like to quickly duplicate individual items within a stack.
See video attached for example:
1. Outside of stack groups the default behavior of holding ALT/Option key while clicking and dragging an object is to duplicate it.
2. Holding ALT/Option key on an object within a stack group does nothing.
3. (Workaround) Copy / Pasting an object within a stack group with Command+C & Command+V duplicates the object in the correct location.
This is 1 of 2 minor bugs I've found with stacks, but I think I'm only finding them because I love stacks so much as a workflow increase. The other is here: https://adobexd.uservoice.com/forums/353007-adobe-xd-feature-requests/suggestions/40845094-pasting-object-into-stack-group-should-align-it-wi
As per the OP, closing this as fixed in XD31. Thanks for circling back with us!
Zach Bruce commented
Just noticed this was fixed in the July update so it can be closed! Yay!