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How to access the files from the database via the plugin editor?

I am trying to do some read operations on the files that were uploaded into the the database using the plugin editor. However, the way the files were stored in bubble were links to the s3 bucket where they are stored. I tried running a xmlhttprequest to call it in the server side but it kept saying invalid url or link! Is there any way to read files that were already uploaded in the bubble database from the plugin editor?