Messenger get received image in original size?

Hello. This might be related to Facebook (FB) api request. But some might have encountered the same issue.

When user send image to the FB messenger bot. Storing it as image {variable} we get a 280*280 FB format url.

Does anyone know how to get the original image url directly from onsequel? Wha't the code to get this specific FBuserID specific FBimageID in this FBpostID? knowing he could sent an other image 1 minute later and so get for it a different FBimageID in a different FBpostID.

All code or trick appreciated!!!