Managing lightroom classic and lightroom cc

I’ve used Lightroom ‘classic’ for years and am a compete amateur. I’m just neurotic about keeping track of photos etc. I always had issues with the catalog and also getting my photos to the cloud so the new CC is cool. I’m essentially ‘redoing’ the storage of all 50k photos I have, so I put them onto cc, then installed a fresh Lightroom classic and chose sync. It’s now syncing all files to classic on an external drive- which is what I want. I also have cc on our mobile devises so new camera pix are coming to cc, then syncing to desktop - super cool.

My question is if I import photos to Lightroom classic, ie from GoPro or legacy phones, will those photos sync back to Lightroom cc in the cloud? Maybe I should add them to Lightroom cc, which will sync back to classic -  but I have thousands on my phones that I just want to sync to classic, then go to cloud cc.

I hope this workflow doesn’t sound convoluted.  My goals are having cloud versions of photos, and a backup on external HDs.