This doesn't answer my question. I'll try to refrase it:

Sometimes when I host a meeting, I may need access to documents stored in Team belonging to another organization, a Team in which I myself am only a guest. But as long as I am hosting a meeting that I myself have initiated, I can't access such documents without leaving the meeting. 

 

This problem does not occur when I join a meeting as a participant, only when I am the host. 

 

For those of us who collaborate extensively and on equal terms with partners outside our own organizations, this is a frequent challenge. @ChristianBergstrom 

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