Temporary diagnostic only. No candidate details, route packs or existing files are read or uploaded. This test uses only Files.ReadWrite.AppFolder.
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The test first reads the app folder. If that fails, it attempts to write a small text file frtol-connection-test.txt directly into the app folder, then reads the folder again. It never requests access to the OneDrive root or your other files. The test file may remain in the app folder if creation succeeds.