de real code for embed is https://openload.io/embed/APa-kocDhjEHi. Can you change format link. Some websites support only alphanumeric characters. Link https://openload.io/embed/APa-kocDhjE/ don`t work because have sign -.
if you add anything after https://openload.io/embed/APa-kocDhjE/ the code is the same
so u can just copy code until / and its work try and u will see
https://openload.io/embed/APa-kocDhjE
is
https://openload.io/embed/APa-kocDhjE/tfsghzjzjkjzd
is
https://openload.io/embed/APa-kocDhjE/gabdsjadabdkajbdalkjb
like i say
https://openload.io/embed/APa-kocDhjE is the code