Currently I have a pdf uploaded into a File activity. If the file is set to Embedded, I will see the file inside Moodle and the file access will be logged. If I refresh the page, the file access will be logged again.
If I set the file to open in a popup, the first time the popup is opened, a file access is logged. However, subsequent refreshes of the file do not log the access.
We have had issues with students opening a popup window with a file and during a test, refreshing the tab to look at the file. This displayed no log of the file access during the test.