Custom media from am1x file not displaying in PRO-300 driver

[mrswitters]

I would like to print with Canon Platine Fiber rag. That paper comes with an am1x file with custom media types. I used the Canon Media Configuration Tool (MCT) to add the am1x file to my PRO-300 printer. It appears that the am1x file was installed correctly—it is listed under "Custom" in MCT for my PRO-300. 

However, when I go to print, I do not see a "Custom" option in Quality & Media > Media Type, which is where it should appear:

Any ideas? 

[mrswitters]

Never mind, I figured it out! I had to go into the PRO-300 Printer Utility and select "Update Media Information" to get the Custom paper to appear in the printer driver. I installed that am1x file from a different computer—maybe that had something to do with it.