Joplin Android isn't correctly attaching PDF files

If I create a new note, then attach a PDF file, the note is created and shows a PDF icon. However, the OS does not treat the file as a PDF when opening (I am presented with non-PDF apps to choose from to open the file).

If I instead use the Android share function and share a file to the Joplin app, a new note is created and the link within the note is handled correctly as a PDF.

I am on Joplin 1.3.13 for Android.

Is anyone else seeing this?