2021 error when adding files to projects

Hello, I installed my recently purchased version of Studio 2021 but when I come to add a new file to an existing project, I get an error message. 'Failed to Add XXX file in the path YYY. Access to path YYY denied.' I have no other applications running and I am using Windows 10. Any suggestions on how to resolve this are very welcome as I cannot keep using 2019 indefinitely...

Thanks Gillian

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