Cannot Share Photos in iOS 17

Using iOS 17 on an iPhone 15 Pro Max.

- I'm unable to take a picture and immediately share it - via any app. In other words, if I take a picture and want to immediately attach it to a text message, I cannot. I'm presented with the "Preparing..." pop-up up, and it eventually just times out with an "Unable to Share: There was an error while preparing to share. Please try again later." message. As of this morning, it seems that I only have to wait around 5 minutes to share a photo that I take. Before today, it seemed to take a lot longer.

- iCloud sync of new photos takes forever. I can’t be specific, but it’s somewhere between a few hours and a day. I took about 20 photos 45 minutes ago, and the iCloud Photo sync status has been stuck at “Syncing...” since then. Rebooting or enabling/re-enabling sync does nothing to resolve the issue.