That sounds strange!
Are you getting any error on the images whiles you are trying to save them over the cloud via PS Mix app?
Also, just wanted to confirm if you are signed into the apps and libraries using the same Adobe ID.
No error messages. Just "in process" when looking at the syncing status in LR Mobile. Definitely signed in correctly. In this LR Mobile project all of the image files synced via LR Mobile except the ones that I also edited in PS Fix and then saved back into LR Mobile as PSD files.
So is the issue only happening with Lr Mobile?
I have this exact same issue currently. Using Lightroom mobile on a brand new ipad pro. Editing in photoshop fix app (because for some reason adobe refuses to allow spot removal in LRM). Saves it back to LRM as a PSD file. When I pull up Lightroom CC on desktop... Nothing... nada... zilch...zero. I've had tech support jump in and change all my settings. I've factory reset my whole computer, verified my internet connection is sufficient, etc etc.... Nothing. What is happening here? Is there a solution?
I've have models waiting for files that I can't not deliver because I chose to trust Adobe on the mobile app. I've spent a week on this. Someone PLEASE GIVE ME A SOLUTION......