Does Attachment > Share from Files Duplicate Files/Folders? Or merely links?

I noticed after starting to attach my existing Nextcloud files using the Attachments > Share from Files modal that there is now duplicate folders and files in a root 'Deck' folder in my NC instance. It appears there are duplicated as when I search for a file, it appears both in the original folder that I linked to a Deck card and again in the 'Deck' folder in the root directory.

But I also noticed that revisions or additions to only the folder/file in the root 'Deck; folder is also replicated in the originally linked file/folder. So there is some linking being done but I am unsure whether there the root 'Deck' folder is merely a linked reference or if it is a duplication of the original files/folder that then also updates the original.

I am looking to keep my file/folder structure more lean and do not want duplication of working folders/files but I cannot find any specific details in the documentation about this. Please point me in the right direction to find more details.

Review the documentation for the Attachments > Share from Files modal and the root “Deck” folder behavior. Clarify whether shared files and folders are linked or duplicated, and document how revisions or additions are synchronized; the issue mentions no specific file or test to start from.