Since PowerApps follows a declarative pattern why not allow the export and import of an XML representation of screens or other objects. This would allow the transfer of screens from one app to another as well as providing a foundation for object cut, copy and paste. An XML representation would allow a simple way to search and replace text or settings on a global basis then import the XML back in.
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Thanks everyone for the feedback. We'll take a deeper look.
You all are correct, technically this isn't hard especially for text. However, the security implications are very interesting and will require a thorough review. And then, as usual, it needs to be prioritized and funded.