Just in case anyone is having an issue still - I found that although the gmail client on some droid phones doesn't allow you to pick a non gallery attachment from within the app menu, it does allow you to attach any file from your standard file browser app (mines called My Files) by long clicking and using the pop up menu, or pressing the menu button to bring up the general menu options and hitting the 'Share' button there.
My phone is a Galaxy Ace and it works for me
You can send 1 attachment with the long press, or multiple attachments using share (lets you mark multiple items)
So you just have to remember to do that before you compose your mail!
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