How to use photos with exclamation mark without limitations?

Hi all,

I have many photos in my iPhone with an exclamation mark. I understand that the exclamation mark indicates that the picture is not in original quality. But I don't have the picture in original quality. It means, that the picture is stored in my iPhone as well as in iCloud in a low resolution (reasons are historical).

While the picture has the exclamation mark, it not possible to work with it normally. For example it is not possible to modify the picture, to share it via AirDrop, ... But for me it is a normal picture, although in a low resolution. Therefore I would like to work with the picture as with a normal one. Is there any way how?

Roman