How do I enable " Allow package to be uninstalled"

[CapU]

"You have to edit the package in either Casper Admin or within the pkg details in the JSS to check the box labeled "Allow package to be be uninstalled" Once you do that and save the changes, back in your policy, the uninstall option will be available."

I have done this but don't see an option to delete the app. Am I missing something?
Im trying to silently uninstall Creative Cloud Desktop app

[CapU · Accepted solution]

Figured it out

[basmith21]

My option is "Greyed out". It is a .dmg file.

[bentoms]

@basmith21 you'll need to index the .dmg 1st.