One Proof for multiple files

Description/Current Behaviour - When you have online marketing assets for example for Social Media posts you not always have one file for the post. In most cases the Text and the picture(s) are separated files because you need to upload it separately from each other. It would be helpfull for this cases when you could create a single proof over two or more files.

Why is this feature important to you - That would increase the efficiency of creating such adds and we would also increase the transparency, because now you really need to see wich picture is for which text and the other was round.

How would you like the feature to work - That it is possible to create a proof over more then one file. Either to enter the file in the Proof creation or that when some files are selected that you are able to create one Proof for all selected documents in the project/task.