u/Green_Juggernaut_815

Hi, I was working on a project and I changed the aspect ratio to be wide-screen as it was previously 16 by 9, however I wanted to shrink part of it to include what was cropped but it seems to be gone, I've tried uploading new versions of the original footage and it also was missing the parts that were cropped when I made it smaller. Does anyone know how to fix this? Thanks in advance.