Per your request here is my feedback ID: FB8908497
jammyman34
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Exact same issue on a project I created (and worked many hours on) prior to updating to Big Sur.
I also created a brand new project as a test and it's giving me this error when I attempt to preview via canvas:
RemoteHumanReadableError: Failed to update preview. Error encountered when sending 'previewInstances' message to agent. ================================== | RemoteHumanReadableError: Unknown preview provider "ContentViewPreviews"| | TestAppName does not contain a preview provider named "ContentViewPreviews". Check your build settings to ensure the preview provider is compiled into your product.| | Mangled name: 0016TestAppName0021ContentViewPreviewsV