FileField Sources Flysystem module enhances the functionalities of Filefield Sources module for Drupal 8.It allows you to connect with different filesystems like dropbox, S3 etc uisng flysystem and you can select files from different directories of that filesystem and upload it in you drupal storage. you can also access files directly from remote storage by using "serve from your current location".
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Place this module directory in your modules folder (this will usually be "modules/").
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Enable the module within your Drupal site.
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Add or configure an existing file or image field. To configure a typical node field, visit Manage -> Structure -> Content types and click "Manage form display" on a type you'd like to modify. Add a new file field or edit an existing one.
While editing the file or image field, you'll have new options available under a "File sources" details. You can enable "File attach by Flysystem" and configure "flysystem setting".
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You can create a content that uses your file and try it.