Following the update to iOS 10.3.1, my phone warned me (unnecessarily as it turned out) that I had too little space to store all my photos at full resolution, and suggested that I switch to "optimized" storage (which for those unfamiliar with the feature stores a uselessly blurry simulacrum of the original only), which I foolishly did.
I immediately realized my mistake, and restored the "Download and Keep Originals" setting. But this appears to have had no effect. I still see only the placeholders, until I click on an individual photo and wait for it to download.
So the question is: what does "Download" mean? Does it mean
- download all photos automatically (e.g., in the background over time) or
- download a photo only when it is viewed?
If the answer is 2, is there a way to force all my photos to sync at full resolution to my iPhone without clicking on each individual photo (which would take about a month of continuous clicking, with no breaks for sleeping)?