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Camera roll
Export Snapchat Memories to the camera roll
In-app Save to Camera Roll is fine for last weekend. It is not how you empty a 5 GB Memories library before a storage cap.
iPhone
Restore on a computer, AirDrop the folder or copy via Files/Finder. Select the images → Share → Save to Photos. Dates should match the EXIF we wrote. If iOS still uses “today,” you saved the unrestored originals.
Android
Copy the restored JPEGs into DCIM/Camera or a dedicated album folder, then open Google Photos → Utilities → restore device backup, or let backup pick up the folder. Media store uses EXIF DateTimeOriginal on JPEGs.