@mk@oracle.skilledtests.com Thank _you_ for your patience. Most of the time a User simply silently uninstalls application facing similar problem... I think :-)

So I will:
1. Rename / add more words to "Display attached images" setting.
Actually it is for downloading attached images, displaying attachments and for attaching them.
Attachments were not downloaded to your device, this is why you didn't see them right after turning this setting on.

2. Add "Attached images: sending and showing" (?) section to the User guide.