Why are contact photos missing on my other device?

Photo sync is an optional Supporter feature on iOS and Android for devices that sync with iCloud (Google Drive on Android). Open Settings → Device Sync and turn on Include images in sync. Photos don't sync with Cloud Sync yet; they stay on the device that added them. This uploads profile and contact photos to your private iCloud container (or WitnessWork's hidden Google Drive folder) and downloads referenced photos; they count against your iCloud or Google storage. Update WitnessWork on every device to use photo revisions safely. Pausing photo sync on one device keeps the uploaded files and local copies. To remove uploaded photos, choose Remove iCloud photos and pause photo sync on other devices first, or they can upload their copies again. Removing a contact or its photo removes downloaded copies when that change arrives; obsolete cloud copies are cleaned up after a one-day grace period. If a photo is missing, keep the device with the original, check storage and permissions, then use Sync now. Use the Help Center’s private support option if it still fails; do not include householder information in public reports.