Astah User Guide
You can add hyperlink to diagrams and models. There are three ways to do so.
You can also add hyperlink by dagging a file directly onto diagram.
When you release the file on a diagram where no model is drawn, you have two choices.
If you choose the above option, a hyperlink will be added to the diagram.
If you choose the bottom option,
The hyperlink will be added with a text (File name).
You can choose what to add as hyperlinks. There are three types of Hyperlinks you can add.
You an search for hyperlinks that no longer exist.
Open [Search] tab, select Invalid Hyperlinks from the dropdown and hit [Search] button.This will list up all the invalid hyperlinks.