[ARCHIVED] This placement requires Deep Link support by the vendor

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Hi, I am trying to manually create a developer key that enables the editor button placement. When I do this, it says the following:

"This placement requires Deep Link support by the vendor. Check with your tool vendor to ensure they support this functionality"

after I create the key, I don't see anything show up on the canvas RCE bar for my new app. Is there a way I can enable my app to show up on the RCE bar? How do I enable Deep Link Support?