I have multiple iPhoto libraries on an external drive. I want to merge them in on Photos library. I know one option is to open each one as a Photo library and upload to iCloud but I only have a 50 GB iCloud and some of the libraries are larger than that. There is a third party app called iPhoto Library Manager. I was going to use it to combine all the iPhoto Libraries and then open them with the Photos app. Will this keep the photos and videos at their original quality? Is there another method I should use? Cheers EDIT: iPhoto Library Manager doesn't work with Mojave so I'm now asking the question about PowerPhotos from the same company.