This is my first post. I wanted to share this after spending hours trying to figure this out.
To add a new media type to a Canon printer (in my case, Lyve canvas from Breathing Color), I successfully went through all the steps of importing an AM1x file (from the Breathing Color website with the ICC profiles) via the Media Configuration Tool (in Windows) and then updating the driver.
When I looked on my actual printer, the Canon Pro-4100, I can see the new media type in the list on the touch screen. However, when I open Canon Professional Print and Layout (CPPL), there is no sign of the new media type in the Media Type drop down.
I tried rebooting. I reinstalled the AM1x file 2-3 times, to no avail. CPPL just does not show the new media type, but it is on my printer, and it is visible in the Media Configuration Tool list.
Then I finally found the way to add custom media in Professional Print & Layout (PPL) !!!
In addition of adding custom media with the Media Configuration Tool and updating the printer driver, you must do the following in PPL.
1) Go into the file menu
2) Select the "Other Settings" option
3) Click on the Add/Update Media Information
This links the new media type, added with the Media Configuration Tool, with Canon PPL. After these steps, I can select my custom media in the Media Type drop down list.