After you've exported your solution, you can import it into any environment that meets the prerequisites. Follow these steps to import a solution:
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Sign in to Microsoft Flow, and then select Solutions from the navigation bar.
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Select <- Import.
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Select Browse from the Import Solution page that opens.
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Find and then select the solution that you want to import.
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Select Open.
You should now see the Select Solution Package page similar to this image:
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Select Next.
If there are no errors, the importation completes within a few moments.
Note
You cannot import a solution into an environment in which the solution already exists.
Source: Microsoft