Worked through browser share dialog with USR369 for all 6 SOP-DATA-BACKUP.md folders (50-daily, 60-finance, 70-health, 80-kitchen, 90-inner, 95-travel). All confirmed shared as Editor with cai-platform-writer@cai-yttcom.iam.gserviceaccount.com. Discovered Claude's get_file_permissions tool does not surface service-account grants -- used get_file_metadata modifiedTime jumping at the moment of sharing as the verification signal instead, confirmed across all 6. Updated SOP-GDRIVE-SERVICE-ACCOUNT.md to v1.2 with full folder-by-folder confirmation, the verification-method note, and flagged USR369's mention of future community-access-dir scope expansion (not yet defined). T758 (Server 40: key transfer + gdrive-api.php build) remains open and unchanged -- folder sharing does not unblock it, still needs the actual key + Step 2 code.