Hello,
when modifying the path where attachments would be saved within a currently loaded email, the displayed path in the attachment pane is not refreshed automatically as it should. There are at least three ways to force refresh as a workaround: rotate the device; collapse/expand the header pane; go to the email folder list and then back.
I don't remember exactly when this minor, but highly visible and slightly annoying glitch was introduced. Maybe about a year ago. I experience it on various devices including Nexus 7 (2013) with different Android versions.
Thanks!