My iPhone has thousands of photos. I'd like to store them in iCloud Photos, to help me migrate to a new iPhone with less storage.
Looking at my photos in a web browser at icloud.com/photos, it seems my iPhone has only uploaded some of my photos. I can only see about my last 6 months of photos there, but I have many more on my phone.
The documentation I've linked to above is extremely minimal for a complicated feature like this, and doesn't seem to help.
How can I tell the status of the iCloud Photos upload process on my iOS 14 iPhone?