I don't usually bother watching videos, I don't have the time to waste especially when it's something that isn't a pressing need / major paint point for me.
I just want to figure out what the service is about and whether it's worth my time as soon as possible so I can bounce / explore further.
So IMO the screenshot would be much better and less expensive / difficult for you to produce!
There is one thing I don't get with your product actually, why would a team need it instead of keeping using whatever chat or messaging system they are currently using and putting links to google docs or shared drive on it?
Maybe I am not getting what your app is about after all...
Staply is not made for teams :) It is more for freelancers/student/speakers/... for all kinds of their use cases when they need to share several files and links with a group of people and have a context of who shared what when and why.
Nowadays they get a link in some cloud storage send it via email that you loose it and if you want to add one more person into the discussion it becomes messy. Or they use FB chat that doesn't work in many cases. etc.
I just want to figure out what the service is about and whether it's worth my time as soon as possible so I can bounce / explore further.
So IMO the screenshot would be much better and less expensive / difficult for you to produce!