I've successfully joined two paths to create two arrows from a single point but when I add a third arrow I get strange behavior and lose a path. What is the correct workflow?
But three gives me problems...
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Arrows can only go from one edge of the path to the other, consider making each arrowhead it's own individual shape and just placing them along the points of the path/stroke where you want them.
If the arrowhead was it's own shape, you can just place it how you'd like along the path (which would just be a standard stroke)
You could also use this script called Dup At Selected Anchors by Hiroyuki Sato to place arrowheads on many points.
You only need to make one and then run the script which will copy them on all the points. (You will still need to manually rotate them how you liked).
For the arrowhead, there are many options on how to go about creating one, it is a very simple shape, so it shouldn't be that complicated.
Here I made a few samples I created using some shapes (from the polygon tool) and a bit of Shape Builder Tool work:
Simple path, 3 corners and arrowhead I just made:
Clone arrowhead 3 times and place how I like:
Now, to merge the shapes, Select the stroke and go to Object → Expand and select only Stroke
Select all the shapes (including the arrowheads) and open the Pathfinder Panel*
Window → Pathfinder or Shift+Ctrl+9
Choose the Unite option
It is now all one path
*You can also just group them together for now, so you can more easily make changes, and then at the end, if you need to, unite them with pathfinder.