Can't upload video using page posts from ads manager

the last week i was able to make posts using page posts from ads manager but today i can’t even upload video using it
here is the problem

can anyone help me with this ?

Hmm, maybe for that reason they are preventing you from doing this. Did you ask their support? It’s either a bug on their part or something on purpose…

@Johnny i thought this too, so i created a new account and new page and tried again and the the same issue :S
and i posts now from support community to see how to solve this , but i notice this happened after i link the page with business accounts :S