.mounted file has been created but the programme cannot read it

[Okayneed]

Hi, I installed this programme on my QNAP NAS. I've created a ".mounted" file in the download folder, and I can also read the ".mounted" file in the container using the "ls -a" command. Also, if I do "mkdir" in the "iCloud" folder inside the container, the change gets synced outside the container(which means the download folder is surely mounted correctly). However, this programme cannot find the ".mounted" file and keeps telling the volume is not mounted correctly. How can I fix it