below here i have created two objects but in the edit mode (same mesh but seperate objects) then i merged them. i merged the horizontal part with the vertical part. i am trying to bevel using ctrl B the highlighted edge. it wouldnt budge. have you any idea why? i tried to remove the bevel modifier or apply it but it wouldnt work
so i merged by distance and i was able to bevel my edge. but another issue came up. which could be a piece of cake for you but i cant seem to be able to wrap my head around.