The speakers should upload their slides 24h before their presentations, by logging into their LIP indico account and using the section "My contributions" on the left side menu.
They should test their connection and zoom setup half an hour before the start of their session, using the rooms of their sessions, listed at https://indico.lip.pt/event/592/page/108-zoom-connections (password sent by email). This includes testing their microphone, speakers, sharing of slides, full screen mode and changing slides (when in full screen mode).