This issue probably has been raised already but I will repeat it. First, I have the latest version of 1Password 4.5.1 (Mac App Store purchase) running on my IOS devices: iPad and iPhone. These devices are up to date with IOS 7.1.1. My Mac is running OS X 10.9.2 (Mac App Store). I’m using iCloud syncing.
From my Mac in the Identity category I have an identity setup with several file attachments. I deleted 5 of these files on my Mac but the files did not deleted on my IOS devices. Unless I am missing something there is no way to delete an attachment independently on my IOS devices.
In the Mini the deleted files are not showing. I presume the Mini is receiving its data directly from the MAC.