Multiple Attachments is clever in that it works with the Open In menu itself and Apple’s Mail app. Every time you need to send a message with multiple files in it, you can send one file at a time to Multiple Attachments using “Open In”; as you keep sending files to the app, it’ll show you their icons and names on its main screen. When you are ready to send a message with those files, hit the Share button and Multiple Attachments will bring up a Mail panel, composing a new message with the files you’ve sent to the app. Then, you only need to confirm the email account you want to send from, and you’re done.
Essentially, Multiple Attachments works as a container of temporary files based on two of Apple’s inter-app communication features – Open In and Mail sharing. The app stores files until you send them (or delete them with the Trash button), and it’s clever in how it combines temporary storage with the ability to send emails outside the main Mail app. Attachments can be previewed individually, and, in my tests, the app performed as advertised, collecting files sent via Open In and sending them as a message with multiple attachments using accounts configured in Mail. It’s a rudimentary solution, but it works.
Someday, it’s likely that Apple will revamp how iOS apps communicate with each other and offer a way to collect multiple files in an email message at once. Until that day, Multiple Attachments provides a simple way to send an email message with multiple files on an iPhone and iPad – it’s a small victory, especially if you work on iOS a lot every day.
Nice app for us iOS power users and as Federico says, Apple are likely to build this functionality into iOS in the future, so for now this is a nice work-around.
You can download it for free here.