Lightroom Desktop is synching photos with mobile app (iOS), but doesn't keep them in folders

Hi there,

Sorry if this is a common question but I couldn't find my answer elsewhere. I have the Lightroom Desktop subscription (only purchased a couple of weeks ago, so I assume it is the latest version) and Lightroom mobile (iOS). On my desktop app, I have a folder called 2023 and then sub-folders within this. All of the photos within these folders are synching with Lightroom Mobile, but only if I click on 'All Photos'. It displays the names of all my folders (in fact, to be more precise it lists them under a heading called 'Albums' even though they are folders), but it says all of them are 'empty'. So the only way I can view the photos is by going to the 'all photos' tab, which isn't ideal. 

The files are mostly raw but with some jpeg. I'm not using any VPNs or anything and my internet is good. 

All I can think is that it doesn't like the fact my photos are in folders rather than albums. Is this the root cause? My filing system on desktop is to store photos in folders labelled with the event I took them at, and then eventually I'll create albums with photos on shared themes. Is this wrong? 

Thanks in advance for any assistance.

Andy