HeySummit does not have a separate Gather Voices provider. You can still use a video created in Gather Voices by adding it to a session as pre-recorded content. Use the option that matches the video you have:
If you published or uploaded the video to a supported video host, select that provider in HeySummit and paste the video URL or ID.
If Gather Voices gives you an embeddable player or gallery code, select Embed Code and paste the full code.
Add the video to a session
Go to Content & Schedule > Sessions.
Open the session’s Actions menu and select Manage Session.
Open the Broadcast tab.
Set Broadcast Type to Pre-recorded.
Select the relevant provider or Embed Code.
Paste the video URL, ID, or embed code into the field.
Select Save and Close.
Check the player before promoting the session. Use organiser Preview to check the player and layout, then check the normal session page separately with an existing authorised attendee. Organiser preview can bypass HeySummit ticket checks and scheduled seeking. Provider access settings still apply. Third-party embeds can have their own privacy, playback, or browser restrictions.
For Gather Voices export and gallery options, see its official video sharing walkthrough.