Lightroom Classic Sync to Lightroom mobile( iPad)

Photos you upload to Lightroom on your iPad will automatically sync and download to Lightroom Classic when the sync connection is on and working.

Photos that were imported to Lightroom Classic on your computer will only sync to your iPad when you intentionally choose to sync them. Most often that is done by putting photos in a collection and syncing the collection. A synced collection shows up in Lightroom as an Album. The original full resolution images do NOT upload to the cloud, only smart high res previews do. If I am reading your post correctly, it sounds like you were not aware of this.

Please provide more information. Do you not see any images in Lightroom on the iPad, or do you not see recent images? If the latter, you do remember that you need to add images to a synced collection in Lightroom Classic to get them to sync, don't you?