Hi Spatapp123,
We recommend that you try the steps in the link below for help with cut, copy, and paste on your iPhone.
Select, cut, copy, and paste text on iPhone - Apple Support
To perform the recommended troubleshooting steps via the link above, complete the steps in the section titled "Select and edit text."
1. To select text, do any of the following:
* Select a word: Double-tap with one finger.
* Select a paragraph: Triple-tap with one finger.
* Select a block of text: Double-tap and hold the first word in the block, then move the grab points to select text.
2. After selecting the text you want to revise, you can type, or tap the selection to see editing options:
* Cut: Tap Cut or pinch closed with three fingers two times.
* Copy: Tap Copy or pinch closed with three fingers.
* Paste: Tap Paste or pinch open with three fingers.
* Select All: Select all the text in the document.
* Replace: View suggested replacement text, or have Siri suggest alternative text.
* Format: Format the selected text.
*
: View more options.
Tip: To move text without cutting or copying, touch and hold selected text until it lifts up, then drag the text to another location.
Insert or edit text by typing
1. Place the insertion point where you want to add or edit text by doing any of the following:
* Tap where you want to add or edit text.
* Touch and hold to magnify the text, then move the insertion point by dragging it.
Note: To navigate a long document, touch and hold the right edge of the document, then drag the scroller to locate the text you want to revise.
2. Type or paste the text you want to add.
You can also use Universal Clipboard to cut or copy something as you normally would on one Apple device and paste it to another. See Cut, copy, and paste between iPhone and other devices.
We recommend the steps above because they will show you how to select, cut, copy, and paste text on your iPhone.
If you’re still experiencing the same issue, then we suggest that you try the steps here; Restart your iPhone - Apple Support
Please let us know the outcome after giving the above steps a try.
Thanks for using the Apple Support Communities.
Cheers!