Very strange bug. I can’t add interactions to some objects, and I can’t see any reason why. Basically I have a group with a couple of shapes in it, and when I am on the Prototype tab, it doesn’t show a “+” to the right of “Interactions” and it doesn’t show the link handle in the main area.
Above: a normal selection that I can link
Above: an abnormal selection that I can’t link.
The only other differences between the two selections that I can find are in the Design panel:
I just discovered the same issue in my own prototype. I tried grouping a selection of shapes to see if that enabled me to make connections. It didn’t. I’m supposed to finish my low-fidelity prototype as an assignment and coming across this bug and finding out there isn’t a fix yet is incredibly stressful.
I had the same problem. Saw that I can only connect the shapes that are grouped. So I put every line, every shape I had into the group (site) it belonged to and then could connect them with other sites. So basically check if at the left panel, where you see all your shapes, everything is grouped based on the site. If not, then drag them under the site name they should be. Hope this helps!