Once a guest is invited into a Bolster...
A guest CAN:
=> Upload a file
=> Create/collaborate on a document
=> Create a note
=> Post, comment, and like in the interactions feed
=> Initiate a chat
=> Create/Complete a task/subtasks
=> Join a video chat that a full member has initiated
A guest CANNOT:
=> Create a new Bolster
=> Initiate a video chat
=> Invite other guests
QUICK TIP: A guest can see everything and everyone within the Bolster you have invited them into.