After Adobe support instructed me to delete sync errors from Lightroom.adobe.com and have me LOOSE DATA from the iPad I decided that I would not reley on what is obviously a support channel that is not up to my standard.
Issue;
In field and taking photos on Nikon D850 and USB-C uploading to LR CC on iPad Pro 2018
1000+ photos on iPad and 80% ended up with a Sync Error.
Adobe support; Delete the Sync Errors from the cloud (which QUICKLY, promptly, and effectively deletes the original from LR CC on the iPad). No sync issue, and NO PHOTO!!!
Work around;
Ignor until you are on reliable WiFi with greater than 50mb/s and not heavily loaded.
What I believe to be the issue
It seems that the Cloud Sync is not using any type of error recovery or reliable transport on the IP Network. If there is ANY error in the transmission, there is not a recovery, but, the sync error. It seems that the application dumps with no checking to the cloud, and if the file is corrupt, it will try again, but not 'recover' the error. The result is on non-reliable Internet that has heavy usage, and is probably 'discarding packets' the photos are corrupt on transmission, thus Sync issue.
LR CC will continue to send the data, thus further 'clogging' the un-reliable internet connection, compounding the issue.
Results
I had 1000+ photos with Sync errors, I stopped (PAUSE) the iPad from syncing to the cloud, and continued to download photos to the iPad. When I returned from the trip, I had 2000+ photos total on the iPad, and resumed Sync at my house. First the new, non-Sync Error Photos went to the cloud, then over then next few hours, all of the previous Sync Errors (Except for the ones that Adobe support had me delete, they are GONE), resolved, and uploaded to the cloud.
This is VERY subpar as I wanted in the field to cloud back up the photos, and it appears from now 3 trips and same issue, that Adobe Lightroom CC for iPad can not perform sync over lower quality internet connections.
Other Notes
iPhoto did sync to Apple Cloud from the iPad and down to the iPhone fine over the unreliable internet that LR CC could not. This is an issue with Adobe's Software and how it performs transmission error correction.
Adobe support DID reach out to arrange 1:1 support, but as this requires 24-48 hours pre-arranged time, the issue resolved before I could engage them. The 'delete from the cloud to resolve' was a CHAT session while on the remote photo shoot.
Conclusion
With iOS 12 you need to upload photos to PHOTO (Apple's app) then import to LR CC. The PHOTO app will have a copy, and does sync to APPLE Cloud successfully on low quality internet where Adobe CC can not. They 'BACKUP' can be achieved via APPLE, and pause SYNC until you're on quality internet.
iOS 13 is to introduce direct reading into Adobe LR CC without using PHOTO, at this time I would not recommend moving to this, as there is no backup (unless this is resolved)
The term "Lower quality" internet I am using is a loose, non-technical expression. What I believe is happening is that when the WiFi connections (now usually 100's of mb/s) connect to rural lower speed internet, there is packet loss. This is NORMAL for IP, and TCP will slow down (reduce window size) to insure packets get through. I have not done a packet trace (yet) on this to see if it is UDP or TCP, and if it is a transmission issue (IP) or if a simple pack re-order issue can cause the issue.
Hope this helps others.
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