AI Old.zip and v 1.5 AI.zip were failing to sync/copy consistently. Cross-checked failure against two unrelated tools (FreeFileSync and rclone FTP) -- both failed identically while a much larger file in the same batch transferred cleanly, ruling out network/timeout and confirming server-side file corruption. David deleted both files. Diagnostic pattern logged to memory pipeline as K359 for reuse on future similar cases.