It sounds like you added a 200GB folder to your iCloud Drive folder on your Mac, and while it shows the full size on your Mac, it only shows about 2GB used in your iCloud storage. When you check iCloud.com, the folder appears, but it doesn’t show the size of the folder, which is frustrating because it makes it hard to tell what’s actually stored in the cloud.
What’s likely happening is that your Mac has stored the folder locally in the iCloud Drive folder, but the files haven’t actually uploaded to iCloud yet. This can happen for a few reasons: you might not have enough iCloud storage space, your Mac could be set to optimize storage (which keeps files on your Mac instead of uploading them), or your Mac might not have been connected to Wi-Fi long enough to finish uploading everything.
To check this, open your iCloud Drive folder in Finder on your Mac. Right-click the folder or some of the files inside it and choose "Get Info" to see their status. You might also see little cloud icons next to the files: a cloud with an arrow means the file hasn’t uploaded yet, a dotted cloud means it's still syncing, and no icon means the file is already uploaded to iCloud.
If you want to force the files to upload, right-click them and choose "Upload Now" if that option is available. Also, go to System Settings > Apple ID > iCloud > iCloud Drive > Options, and turn off “Optimize Mac Storage.” This will make sure your Mac keeps full versions of files and starts uploading them to iCloud when connected to Wi-Fi.
It’s also a good idea to check your iCloud storage to make sure you have enough space for the full 200GB folder. Go to System Settings > Apple ID > iCloud > Manage Account Storage to see how much space you have left.
Just remember that even though the folder shows up on iCloud.com, that doesn’t mean all the files are there yet. Apple’s website doesn’t show folder sizes, so you’ll need to look on your Mac to see what has uploaded.
In short, the files are still sitting locally on your Mac and haven’t made it to iCloud. With a few changes in your settings and a good Wi-Fi connection, your Mac should start syncing the rest of the folder soon.
