Upload files to Zoho WorkDrive - FAILED

Upload files to Zoho WorkDrive - FAILED

Hi there.
I log into my Zoho WorkDrive from my home computer, I attempt to upload files to WorkDrive, but the status window by the system tray registers the file transfer as 'failed' after a few seconds. Never works - checked firewalls, reboots, disabled Google Drive Sync, disabled AV etc

When trying to complete the same activity with the same files from a different computer (e.g. at my place of work), I have no issues uploading and the files upload quickly and correctly without fail.

Please help - tips, tricks, technical configuration required?

thanks