Appeared in the cloud - Or, “was seen in a cloud.” The definite article would imply that the cloud was the same which is often mentioned in connection with the tabernacle. The people saw the cloud here spoken of beyond the camp.
Related Commentaries of Exodus 16:10
Exodus 16:10
10 And it came to pass, as Aaron spake unto the whole congregation of the children of Israel, that they looked toward the wilderness, and, behold, the glory of the LORD appeared in the cloud.