Yes, I just tested it here. It does not work. If I select 'Add files' nothing will happen when using iOS. Safari on the Mac works just fine. If I switch its User Agent to 'iPhone iOS 7' or 'iPad iOS 7' it is the same as with the actual iOS device.
Here is the template, but I believe this is a general bug with all 3.1 installations.
Support Request Template
What version of phpBB are you using?
What is your board's URL? http://gartenfreundeforum.dtdns.net
Who do you host your board with?
Hosting it myself on a Turnkey Linux VM
How did you install your board?
I used the download package from phpBB.com
What is the most recent action performed on your board?
Is registration required to reproduce this issue?
Do you have any MODs installed?
What styles do you currently have installed?
only the default
What language(s) is your board currently using?
Which database type/version are you using?
What is your level of experience?
Comfortable with PHP and phpBB
What username can be used to view this issue? No answer given
What password can be used to view this issue? No answer given
When did your problem begin?
After updating to phpBB 3.1 from 3.0.12. It also happens with a fresh install.
Please describe your problem.
It is not possible to attach files using an iOS device. It worked with phpBB 3.0.12 on both iOS 7.x and 8.x, but it does not work with phpBB 3.1. If you click the button to attach a file nothing happens.
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