Nextcloud Desktop Client version 2.5.2git installed on Ubuntu 18.04.3.
I was about 25% of the way of syncing about 600 GB of data between a local drive and a remote Nextcloud server, when suddenly, for no reason I could see, the Nextcloud Desktop Client simply froze. Even though I killed the client, I could not restart the program unless I completely rebooted the computer. Then I could restart the program, but after perhaps one minute of syncing, it would freeze up again. I eventually tried version 2.5.3, but had the exact same problem.
I am too new to all this, I do not know how to determine what is wrong, and how to fix it. Anyone know what should be done?
(Bonus question: I understand that I can drag and drop the directories that I want on the Nextcloud server onto the browser window for Nextcloud, and then it should start uploading the files. But - Is “uploading” the same as “syncing”? Will the files I “upload” be marked as being synchronized?)