What is upward arrow in my mobile gallery. What does that mean ?

[AC Question]

My mobile gallery shows upward arrow at the right side in most photos and videos, what does that mean ?

 

[chanchan05]

It means it's not yet backed up to Samsung cloud.

 

[anon(10396098)]

Hi,
There are other icons too - a cloud with a rectangular shape near the bottom right and a cloud with an upward arrow inside it. Some photos have no icon at all. What do these mean?