Thanks for the responses, but I cannot replicate this; indeed, if I upload a new image with same name as existing asset, I am offered the option of 'Replace', and this works. However, all that does is overwrite the original image AND metadata. Any metadata entered for the first upload is wiped when ...

Does AEM allow replacement of an asset (image or pdf) whilst retaining metadata, title etc?I have read that this should be possible via a 'replace' button when the asset is selected but I don't see this option.