Qsync: Unable to pair a folder

Hello,

I am using Qsync 6.0.0.2418 to synchronize folders between Windows 10 Home and a QNAP NAS.

There were no issues until recently. For some time now, one of my folders on the NAS cannot be paired. It is grayed out, as if it were already paired (and therefore unavailable), but that is not the case.
There are no problems with the other folders, which can be paired.

I have closed Qsync and restarted the application, but the problem persists.

Do you have any idea what might be causing this issue?

Thank you,
Olivier

This is an English Forum, please post in English!

Would it be possible to post screenshots of your issues? Are you sure the parent folder of the folder in question is not paired?

To help us better understand the situation and speed up the troubleshooting process, could you please provide screenshots of settings pages? Thanks!

Could you please clarify your backup target?

Are you planning to back up to a cloud service folder or is it a special type of folder with unique access requirements? Thank you for your assistance!