When you migrate documents to SharePoint, you might encouter import errors with the following (or a similar) message in the migration-center's log files:
Could not upload File! - Error: Server Error on upload request! Status Code:400 [The request message is too big. The server does not allow messages larger than 52428800 bytes.]
This can happen if you try to import files with content larger than 50 MB into SharePoint because the default SharePoint / IIS installation limits the file upload size to 50 MB.
The following article shows which settings need to be changed to import larger files into SharePoint:
For SharePoint 2016, please see also the following article: