P: Background Syncing

Ditto. I have also linked this  thread on the Lightroom Classic forum hosted on Adobe.com.
Hopefully this will finally get fixed. This thread has been active for 5 years now.
https://community.adobe.com/t5/lightroom-classic/apple-iphone-ios-still-times-out-before-sync-finishes/m-p/11250753?page=1#M192161

Well, he's one way to look at it Adobe. I just plain won't use Lightroom unless you implement this feature. I recently took over 200 photos and had to wait three days for them to sync to my desktop app. That's ridiculous. 

Indeed, other apps can do it without issue.
The should also implement split screen and slide over, which could allow LR to remain open and still use other apps...

Agree. I just completed a survey from Adobe about our Lightroom use and put this as the Number One complaint/need for improvement in the product.  However, still not sure this is under Adobe's control. It might be that Apple is preventing Adobe from competing with its iCloud-linked products (which do sync in the background).

This is crazy how it cannot sync in the background or while the device is asleep. Dropbox has been able to do this for almost a decade... All the other cloud applications work just fine - why not Adobe?

The sould at least support slide over and split view in order to be able to continue using the device while it syncs.

And while at it, please also enable auto-import in the background. It would be nice if Lightroom would import & sync everything in the background so that you just have to clear out your camera roll every now and then and you're set.

I was really disappointed this wasn’t an option. I am transitioning from Google Photos to Lightroom and was a bit shocked my photos wouldn’t update in the background.

For previous posters: this is possible on iOS. Traditionally it’s done by allowing Location Services (which Lightroom already asks permission for). Once allowed, an app can register to be notified of coarse changes in location, which allows the app some time to run. When this happens the app checks for and then uploads new pictures. In my experience, it was enough to keep your photos updated automatically even when just going about your day.

I hope Adobe considers adding this. It’s a major flaw.

2019 and still no luck with background sync on iPad Pro 11

My (limited) expertise tells me that this is not an Adobe issue but an iOS issue.  I don't think iOS allows non-Apple apps to "self-initiate."  It requires manual launching, but CAN continue to operate in the background once launched.  I don't know for how long it can remain running in the background.