Are you copying them because you need all the associated formulas or just because Dataverse controls either don't exist or don't have all the same functionality?
If you just want the 'classic' controls, go to Settings in your Dataverse App and at the bottom under Experimental features, turn on 'Classic' controls.
Try this if you need the formulas.
DON'T right click and use that copy function, that doesn't seem to work. Select your control and use the ctrl-c keyboard combination and then use ctrl-v to paste it into your app.
I just tested this and it works.
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