Why can't I edit an existing Link in a Rich Text visualization and save?

[Dave Hoglund]

I have a Rich Text (HTML) Visualization on a Dashboard that has some links to various things.
I need to update some of the Links, but when I try to "Edit HTML" it won't save the changes.

I found a work-around, and that is to re-create the link, and then I am able to Save, and Exit editing mode on the Dashboard. 

Also, I don't see any "Rich Text" visualizations in the list of visualization.  Why don't Rich Text visualizations show in this list?

[Vishal Jaswal]

Hello @Dave Hoglund 

Click the three dots (extreme top right corner) next to attachment icon in the Edit HTML box and click "Source Code" icon (<>) - Find out if HTML is correct (see screenshot below) or somehow corrupted.

[Dave Hoglund]

All looks good.  The existing links work (but were pointing to our DEV instance), so I want to update to our PROD instance.  It just doesn't enable the SAVE option on the Rich Text visualization if I try to edit the existing link.  If I add a 2nd link (same name, proper URL to PROD), then the SAVE button for the visualization will show, and it saves properly