The Purge menu allows you to analyze the remaining space available for documents, and delete documents.
Remaining place
The pie chart at the top left of the menu lets you know how much space is left available for files.
Below, the storage occupied by the documents is indicated in Mb, as well as the storage limit.

Delete files
After selecting a folder in the tree on the left, the list of associated documents appears.
It is also possible to use filters to find documents that have not been viewed since a date or that have X views for example.
In the Action column:
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allows you to download the document;
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allows you to delete the document;
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allows you to delete the history of a document.