Licensing of items from subscription in live streams

Hey! So we recently discovered Envato when looking for material for our upcoming live streams in which we discuss digitalization topics. Watching the streams will be free, we’ll stream using VMix and Vimeo and planning to publish the stream on our own platform. So far so good
Now we were wondering what we have to keep in ind when it comes to licensing
Are we allowed to use e.g. an intro both as teaser on linkedin and in the stream?
When we want to publish the stream afterwards, is that allowed to, with the content from envato market?

Thanks in advance!