I am reading this SharePoint online limits at SharePoint Limits but it did not mention what is the maximum size a SharePoint online document library can hold? or this is applies to the 25 TB which is the Max storage per site (site collection)?

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There is no hard coded limit for the size of a document library in documentation. Technically, a document library can hold large amount of data as long as it doesn’t exceed the limit of a site (site collection).

However, there are limits related to number for files and folders (up to 30 millions) and size limit of each file (250GB) in a document library that you should take into consideration.

You can find these limitations in same documentation at Items in a list or library

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