Start with a copy you can recover
Before handing over your iPhone, decide how you would recover your important files without that phone. A private vault on the same device is not a second copy.
Write down where each collection lives: Photos, Files, Veil or another app. Check the backup method for each one. Keep the copy and the information needed to open it accessible away from the phone.
Keep your credentials to yourself
Apple advises keeping your device passcode and Apple Account password private, and staying present during unlocked software support.
Use the service provider’s current checklist for your model and repair arrangement. A store appointment and a replacement shipment are different situations; do not change account security settings just to follow an old checklist.
Do not use photo deletion as preparation
With iCloud Photos, deleting a photo also removes it from other devices using the same Apple Account.
Avoid a last-minute library clean-up. First establish which copy you will recover from. Importing into Veil creates a separate copy; it does not remove the original from Photos.
Save a Veil backup outside the phone
Open your space and use Backup & transfer to export an encrypted backup. Save the exported file somewhere you can access without this iPhone, and keep the matching recovery code separately.
If you use Veil’s iCloud backup, connect iCloud in the app and confirm the backup has completed. Do not assume the general iPhone backup contains your Veil library. Before any device erasure, test a restore and open the files you care about.
Check the recovered files before removing copies
After recovery, open a photo, play a video and read your important notes or documents. Check recent additions as well as older files.
Restoring a Veil backup creates an independent space with a new recovery code. Save that code for future backups. Keep the earlier backup and its matching code until you have verified the restored collection; restoring a purchase alone does not restore files.