Some Photos Invalid

In the cloud button, it keeps showing "Some Photos Invalid". However, when I view what items have trouble syncing (by filtering "Sync Status" for "Error"), Lightroom shows that there were no photos that are invalid.

How do I fix this issue? I also do notice that my photos are taking significant space on my hard drive, so it seems like maybe the photos are not uploading correctly and is still taking up space on my Mac.