Now, let’s say you want to be able to select a few Gallery Items and the same should be populated to a Gallery and even from Collection as well.
You can use this scenario if you want to create a Collection of some GUIDs/Account Names and then take separate action on it or handle it in some other context.
Let’s take a simple example-
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Multi-select Items from Gallery and adding/removing them from Collections | Power Platform – D365 Demystified
Here’s a quick demo of how you can use Check box to populate a Collection and remove items as you uncheck them from a Gallery Control in Canvas Power Apps
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