Cannot preview in this file - "<filename>.appex is an unsupported extension"

App & System Services General
KeerthanaSrinivasan OP
Created Dec ’22
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I wanted to use deviceActivity target (File->New->Target). A package was created with filename "TotalActivityView".

But i am getting this error while trying to preview it.

ERROR: Cannot preview in this file ".appex is an unsupported extension"

How do I use the deviceActivity target in my project?

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Cannot preview in this file - "&lt;filename&gt;.appex is an unsupported extension"
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