I use my iPad to access shaw webmail from the Safari app. I cannot see a way to attach files such as documents and photos from the compose window. Have I missed something?
Doesn't seem like there is a way to attach files, from testing here on my mobile in the mobile view.
If you are running OS8, you can request a desktop view from Safari that may help you get access to that feature.
Additionally, if this is not a shared device you may consider using the built-in email client on the iPad that will allow you to attach files when sending: How to setup email on an iPhone/iPad on iOS 11
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