Ion-input error

I am unable to edit ion-input in the middle but able to delete from the end and not able to copy paste the key.

I already try by setting user-select property in scss for the tag given below.

<ion-input type="text" [(ngModel)]="test_key"></ion-input>

what you exactly want ? can you explain little bit more ?

I need to write 50 character key, I found 2nd character wrong than I have to delete all 48 character and than edit 2nd one and rewrite all again.

But my requirement is edit any character by moving cursor.