How to upload media to a specific folder without a plugin in Wordpress?

Is there anybody who knows an article that explains and shows a code about creating our own plugin for organising media library with folders in the admin? All media that I upload goes in the wp admin section Media -> Library. For example I have uploaded 100 picture and would be nice to be organised in folders. For example Animals, Flowers, ect.

Topic library media Wordpress

Category Web

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