I'm not even sure where to post this. There is no way to contact support over an issue like this, but I figured I'd try to get help here.

I make guides on Steam which use a lot of images. In the area where you upload images, it states:
"You can select multiple files to upload at once, but only up to 8MB at once"

This does not seem to be the case. In the file select window, you can only select one at a time. I tried shift, control, highlighting, etc. You absolutely cannot select more than one.

Click here for a screenshot showing the message I mentioned.[i.ibb.co]

Is there something I don't know of? Or is this a bug?
Having this feature implemented would be really helpful.