You can use 7-Zip to create smaller multiple files. This is useful when you want to transfer large files and your VPN file transfer is very slow. You can specific how big to set each file.
Select “Split to volumes, bytes” section option to split up the file to smaller files.
Entering 20M for 20MB, 1000M for 1GB.
To unzip, select all the zip files, right click, and “Extract”.