After Installing Plex, it's see just my root folder

Hi All, I need some assistance. Today I bought a new My Cloud Home and succesfully installed Plex Webserver on it. After it redirected me to the Plex web app I’ve tried to add the media folder it, but I can’t see the dedicated folder, but the whole root.

What should I do to see the dedicated Media or Plex folder?

Under Add Folders menu click Browse For Media Folder.
Select a folder with content.
Click Add Library.

This may take time depending on the amount of files in the folder.

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Thank you! I would never have realised on my own that the “mch” is stands for “My Cloud Hom”

And where can I find other user folders or the public folder?