objects do not snap to objects within a group
When scaling or repositioning objects contained within a group, the object should snap to other objects within that group (when smart guides are enabled)
David Castillo shared this idea
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Seconded. Video shows linked object in frame doesn't snap/smart guides don't work when in the group.
However, when ungrouped, it works fine.
Smart guides should work irrespective of group
Same here. I have a table in a table. When dragging the inner table's borders, it would not snap to cell boundaries of the outer table.