I will try to summarize. I followed apple advice as stated in article: Migrate your Aperture library to the Photos app. No problem. HUGE library (400GB). So I now have 2 libraries for use in photos. I want to combine them into one (will be 600+ GB) for ease of use and also iCloud backup. I read an article by Adam (TidBITS founder) from 2019 about merging photos libraries using iCloud.
Need to Merge Photos Libraries? Here Are Your Options - Mac Business Solutions - Apple Premier Partner
In the section Merging Through iCloud Photos when I go to set the new (former aperture) library as the System Photo Library I get a message that says: Switching the System Photo Library will turn off iCloud Photos. Any photos and videos that have not been fully downloaded will be removed from this Mac. Turn on iCloud Photos for this new System Library in Preferences.
This was unexpected.
- How do I download ALL pics from iCloud (I assume that this is necessary because some are thumbnails of full resolution pics in the cloud).
- Still a little shaky on how this combines the libraries.
Maybe there is a better way?
Thanks for any info/ advice/help