I'm not sure if this is the right place to put this but the button where you select your attachments to add on to your post keeps disappearing for me. Is this a bug or is it meant to be like this? If my description isn't clear enough for you, here's a picture of what I mean.

Try again. It might just be a glitch in the program. It sometimes happens to me too. I just reload the page and the attachment comes back.