REPLACE IMAGE ICON NOT WORKING!! need fixed ASAP!

I have a TV radio program where each week I made images for each episode like I've done for over 3 years. however, this morning the REPLACE feature in Adobe Express is NOT WORKING! need to get these locked and loaded for all the 20 TV platforms NOW! Please fix!! it's the bottom right feature between TRANSFORM and DELETE buttons. REPLACE icon does not work at all. I'm trying to replace another picutre in my image. I have many to make. need fixed asap!