Case File Upload Failure (.xml)-File Size Issue

Historically, XML files of 37MB or more have been uploading successfully for cases.

Recently, a 35MB XML file failed for being too large. File sizes of 15MB & 8MB also failed. When the file size is under 5MB it appears to upload successfully.

Since the original file was simply split into 6 or 7 files and then successfully upload, I think this ruled out any data issue within the file.