Had some issues where my client would display a 404 File missing on “GET and “your sync clients are blocked from further uploads nextcloud”
Solved it by rolling back to client 3.0 https://download.nextcloud.com/desktop/releases/Windows/Nextcloud-3.0.0-setup.exe
And removing the Ransomware Protection App from the Nextcloud dashboard on your admin account.
For some reason it was detecting .bin files from unreal engine as ransomware.
Uninstalled my 3.2 client, removed connection, installed 3.0 and synced it on the new folder.
Everything is syncing properly now.