On first TreeShare to Ancestry, you can tick the little box to not upload media. I am not certain if that media will then upload later or not. It has been suggested that you alter the folder name which will cause links to break and not upload. For example, I keep all of my media in subfolders of a Folder named Media. So I have sub folders named things like Census, VitalRecords etc. If I don’t want any media to upload, I would rename my Media folder to something like ‘Media1’. When I was done TreeSharing, I would name it back to Media. Or if there are specific subfolders that I don’t want to upload, then I would name only those folders a little differently, then change them back after TreeShare.