If you moved to a new phone and still have your old device with your 1SE on it, you can back up and restore your videos with a Pro subscription.
If you restored your phone or moved to a new one and don't have your old device any more, subscribing to Pro won't recover your snippets, because they were never stored on our servers.
To try recovering them from an iCloud backup, see How to Restore 1SE with iCloud.
A subscription backs up your snippets from now on, in case you change phones again or your phone is damaged.