On MacBook it states 1231 photos, 26 videos, unable to upload 218 items.
Ipad has 1013 items, 26 videos. So 1231 -1013 = 218
Icloud using only 6 GB of 50. So I took a few photos with iPad today and they went to iCloud and show on the MacBook. Scanned a few into MacBook and those wend to iCloud and iPad. These 218 I can identify and they look exactly like those that uploaded, jpeg format. In fact, I took a series of 7 photos (same time) with an iPad but only 1 uploaded.
I just activated a new MacBook M1 and it reads out like the iPad 1013 items. So these 218 are a mystery resident on this old MacBook.