Plex Folder Windows 10 share

Hello everyone. I bought a MyCloud Home drive to use it as a DLNA server in our LAN. I managed to enable Plex on the MyCloud account by attaching it to a router, which is connected to the internet. After that I saw the folder “Plex” in my account and was able to upload a picture.
The intended scenario is, that files should be uploaded trough a windows 10 PC. My problem is, that I cannot access the PLEX folder. I got acces to the “Public” folder using network folder Z:\172.20.242.133\Public, but Y:\172.20.242.133\Plex doesnt work. Am I doing something wrong or is this not possible?
Thank you in advance for your help!

@SBRostock
Have you checked the Knowledge Base?
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Yes, I did. Didn’t find an answer there.