Users can currently send & share files such as images, PDFs and videos in Google Chat messages and use the Shared tab to access all conversation-related artifacts including files, links and media. However, only one image can be uploaded in a single Chat message on web at a time. 

To improve upon this functionality, provide a highly-requested feature, and match the mobile experience, we’re excited to announce that users can now upload and send up to 20 multimedia files (photos and videos) in one Chat message. Dragging and dropping multimedia files into the compose bar from your desktop is also supported. 

• Admins: There is no admin control for this feature. 
• End users:
  An error message will show if a user exceeds size limits or uploads unsupported file combinations. Visit the Help Center to learn more about sending & sharing files in Google Chat messages. 

Rollout pace

• Rapid Release domains: Extended rollout (potentially longer than 15 days for feature visibility) starting on November 19, 2024, with expected completion by December 3, 2024
• Scheduled Release domains: Full rollout (1–3 days for feature visibility) starting on December 12, 2024 

• Available to all Google Workspace customers, Workspace Individual Subscribers, and users with personal Google accounts

Resources 

• Google Help: Send & share files in Google Chat messages