Synology Cloud Station Drive doesn't find my second hard drive

Hello,

I just installed Manjaro on my main machine and need to get synology cloudstation drive (download from AUR) working. The files I want to synchronize are on a second harddrive. But the GUI tool doesn't find my second harddrive, I only see my boot drive.
I noticed, that my second harddrive doesn't get mounted during boot. Could this be the issue? And if so, how do I mount my harddrive on boot?

Surely, a Search would reveal that?

So, I managed to get a workaround running.
Following this guide https://forum.manjaro.org/t/wiki-howto-permanent-mount-for-partition/26187 I am now able to access my drive from the root directory. So it technically works.

But still I'm confused why my second drive doesn't show up here?

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