Microsoft 365 Copilot + SharePoint

How to stay uptodate about the size limitation topic:

The MS support article "Keep it short and simple" is the official page to stay uptodate about changes regarding document size limitation: Keep it short and sweet: a guide on the length of documents that you provide to Copilot - Microsoft Support

The article is also good to understand how Copilot handles files which are larger than the current limitations. 

Since M365 Copilot works with data on MS Graph, which means search plays a role in here. Therefore I would keep an eye on this article related to search limitations too: Search limits for SharePoint - SharePoint in Microsoft 365 | Microsoft Learn

What you could do now:

I would build an agent to handle sumarizing and analyse of the larger files.

Here there are limitations to keep an eye on, too:

For OneDrive: Quotas and limits - Microsoft Copilot Studio | Microsoft Learn

For SharePoint: Quotas and limits - Microsoft Copilot Studio | Microsoft Learn