Scheduler not allowing to paste post information on Reel on Instagram

Hi, 

I'm attempting to use scheduler to post reels on instagram. I get the message, "Your caption will automatically be copied to your clipboard." but they are not. I get into instagram to post and there is nothing copied across, and you are unable to copy the text from the Abobe Express app too. Its so frustrating. 

Please find a video to aid my discription also. 

Thanks

Michael