The tool observes a large number of unhandled exceptions during the file copy portion of flutter create. it is difficult to tell whether the permission issue is caused by the source/destination, or whether it is due to a bug in dart:io.

To work around this, implement a permission check for both the source and dest files. If either fails, the tool can exit with a more specific message.

If these checks pass, then perform the actual copy. If the copy fails, fallback to manually copying the bytes