This is the best of the several iOS clipboard apps Ive tried.
Its one limitation--that it must be running in the background and refreshed occasionally--is imposed by Apple (for our overall benefit), so thats not a criticism.
It stores whatever is copied to the clipboard, but keeps text, links, and images in separate tabs. Text clips are editable.
To select a clip, just tap on it and it will be copied back to the device clipboard, and you can then paste it in wherever you wish.
You can also delete clips that you no longer want.
The Klondike Kid about Clipboard Manager and History, v3.0.1