Picture in Posting Activity won't show up

[sayan-kido]

Whenever I try to post an activity on my profile (I like to do this everytime I do honor scouting), the picture I upload doesn't show up. I don't know if this is a bug or if I'm using a picture in the wrong format(?) As shown in the screenshot (the part that i highlighted with my cursor) It shows that I have a picture but the actual picture would not load.