Allow mutliple items to be attached at once

[tinywombat765]

In the attach items dialogue it'd be nice to be able to select multiple files and attach all of them instead of having to click attach again for each file.

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[aeronavery]

Is this still an issue? In the attach files dialog you can hold the ctrl button to select multiple files. It is a little unclear that there are multiple files selected. When you select another file using ctrl it turns the previous selections grey and the new selection a bright blue color.