How do I embed the doc in itself?
I somehow managed to do so a few weeks ago but cannot replicate that. Coda tells me, “This doc can’t be embedded in itself”
I know I somehow managed to do so. Maybe this was a bug which is now fixed?
The reason I want to do this is:
Views of different tables in the same page, which I can toggle with a button or select.
ok I found an awesome workaround. 
I created a table which contains all the views of different tables I want to use, inside a canvas column.
This canvas column is the only visible content inside a detail view of that table which contains all the views I want to have.
This table with views is filtered by a select using the names of all the views.
The detail view is then set to a horizontal or bottom-navigation.
Since this filtered table only contains one row (because of the select), it also shows only one canvas.