Image changed all album covers

[JesterFX]

Hi all,

I have just added an image cover to one of my songs and it changed the image to ALL of my songs. Is there a fix for this? How can i stop this in the future? Is there a way to undo this?

TIA

Edit: It seems I was adding the image and having 'link to an organised copy of the picture' .

Now I have to redo all albums ho-hum.