How to add custom glue points to shapes?

By adding a custom glue point, you can connect your line anywhere on the shape. 

Usually, when you try to connect two shapes together with a line, the glue points or the connector points appear on the most common points of the shape. This is convenient, except when you want your line connected to a different place on the shape.

To add custom glue-points on a shape:

1. Click on the shape you want to start the connector (line) from 
2. Click on the Connector icon in the contextual toolbar
3. Click on the tip of the connector and drag it to where you want it to connect 
4. Hold the connector for 2 seconds in the exact spot you want it to connect - wait for the glue point to appear. Once connected, you can deselect the connector and continue editing

Connecting to custom glue points