To enable EagleFiler’s system share extension, go to the Extensions pane of System Settings. In the Share Menu section, make sure that EagleFiler Import is checked.
Now, the EagleFiler Import command will be available from the Share menu and Share button in any app that supports sharing (e.g. Safari, News, Finder). You can choose EagleFiler Import to import the current Web page from Safari, the current file from Preview, etc. You can hold down the Option key to have EagleFiler bring up its options window before importing.