There’s a built in browser which should be able to access your email assuming there’s a website for it.
If you’re at home you can also use some fairly basic mods to get Calibre to wirelessly share to your device, nickelmenu and Kobo uncaged would do the trick. Though you have to be on the same WiFi network I believe.
And finally any storage sites like Google drive or Dropbox which don’t require you to use an app can also work. Though on the Libra it won’t be as seamless as it is on a Kobo with Dropbox built in.
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