well, I just tried it again. I opened a file in adobe reader (the official one) and chose share, and aquamail, and it worked as planned. When opening the email, clicking on the attachment opened in adobe reader.
I tried the same using foxit, that I prefer in many ways (but for one), and it did just the same. I thought it was not going to arrive as the refresh hung for about 50 seconds, but I blame my connection, in a busy coffee shop right now, as other network-facing apps also were unresponsive.
Again opening the email opened it in adobe reader (and yes, that is my one reservation about foxit. It does not support opening automatically from another app).
I am using aquamail 1.2.5.14.
I am not conversant with internals of android, so cannot advise - I am sure on past form there are others who can!
I don't want to be rude, Beaky - although I guess it will be - but your reply is meaningless. I know how to attach files and I know it's supposed to work that way, and congratulations that your experiment worked perfectly. But my phone doesn't do what yours does. And knowing that it is supposed to do what yours does, I began started this thread to help resolve the issue. It was not intended to be a poll to find out whose phone works the correct way, it was to find a solution. If your phone works, great; but if you're not conversant in android and cannot advise, then why chime in at all?
And I have File Manager, version 3.1.15056 installed on my phone but for some reason, Aquamail isn't using File Manager, hence my question about how to associate this program with Aquamail.