In the project's grid view, tap on the thumbnail for the snippet you'd like to change or duplicate. While in the detail view, tap on the ellipsis (...) icon at the bottom right-hand corner of the snippet thumbnail—this will bring up a menu with several options.
On an iOS device
Post to Project... (copy)
Please note that if you no longer have the source video of your snippet in your Camera Roll, you'll have limited editing capabilities. For example, you won't be able to change the portion of the video you selected to create your snippet or change its duration.
*The options to edit and copy snippets are only available in the iOS app at the moment.
On an Android device
⚠️ These actions are irreversible. ⚠️