Windows Desktop Client won't upload larger files

I have NextCloud 13.0.5 installed and running with no issues. However, when using the Windows Desktop client (Version 2.3.3 (build 1). ) I receive sync error with files about 9mb or bigger:

\nextcloudsyncfolder,Error transferring - server replied: Not Acceptable

The same files will upload the any browser without error. Also, once loaded on the server the files will download correctly with the Windows Desktop Client.

It seems a cache or file chunking issue, but, I don’t know what to correct? My php.ini allows large files.

What am I missing?