How Do I Import Google Takeout Into Nextcloud?
Nextcloud Memories reads the date inside each photo. Fix that before you sync the folder up.
Nextcloud and its Memories app read the date from inside each photo. A Takeout export has that field empty, so everything piles onto the upload date.
Uploading first and fixing later means a second full sync of every changed file, which over a home connection can take days.
Fix locally, then upload once. Takeout JSON Metadata Fixer writes the dates and places into the files before they leave your computer. It runs on your own computer and is free for your first 500 photos.