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Mohammed Al-SaidMohammed Al-Said 

Remove Instance Names from URLs for documentforce

following the link https://help.salesforce.com/articleView?id=000270912&language=en_US&type=1

Visualforce page with no namespace:
--c.visualforce.com will replace --c..visual.force.com
--c.documentforce.com will replace --c..content.force.com


what I assume for package namespace will be like
Visualforce page with namespace:
--.visualforce.com will replace --..visual.force.com
--.documentforce.com will replace --..content.force.com

now after changing the URL same as document and SF the result are
--.documentforce.com ----------------- not working manage Package
--c.documentforce.com --------------------------------work fine with manage Package

which one do we need to follow for the package namespace?