How to Upload a Data File
Please take a backup of the site prior to attempting a feed.
Feeds is the module for importing or aggregating data into nodes, users, taxonomy terms and other content entities using a web interface without coding a migration. Data can be imported from various formats, such as CSV, JSON, XML and RSS feeds.
In order to properly execute a feed, you must first configure the feed then you can execute [upload] the feed.
Editing the content once uploaded should be done through the Content interface dashboard.
Note: if your Role has permission to configure and upload feed(s) it also has the permission to delete a feed and/or the items imported in the feed en masse [all at once].