We have a premium subscription as a college called Padlet Backpack which gives us a few upgrades over the free (vanilla) version, the main one that suits us if you're sharing video, is bigger file uploads is every student can upload files up to 250MB in size. That's 10 times more than what you get on the free version.
So in a nutshell if you're working with relatively small file sizes ie <25MB do a photo, or a short audio clip, you're fine using the free one. But if you want to use larger file sized you'll want to use the premium account, here's how:
Instead of just googling 'padlet' you'll need to go to our private area: uwcsea.padlet.org then log in, if they are already signed in to the free one, they need to log out, and log back in where it says in light grey writing, Backpack/Briefcase user then they will be asked to "enter your Padlet/Briefcase domain" here they just enter UWCSEA, then they can sign in with their Google account as usual.